CHAPTER 5 INTRODUCTION TO VALUATION: THE TIME VALUE OF MONEY

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CHAPTER 5 INTRODUCTION TO VALUATION: THE TIME VALUE OF MONEY

Answers to Concepts Review and Critical Thinking Questions

1. The four parts are the present value (PV), the future value (FV), the discount rate (r), and the life of the investment (t).

2. Compounding refers to the growth of a dollar amount through time via reinvestment of interest earned.

It is also the process of determining the future value of an investment. Discounting is the process of determining the value today of an amount to be received in the future.

3. Future values grow (assuming a positive rate of return); present values shrink.

4. The future value rises (assuming it’s positive); the present value falls.

5. It would appear to be both deceptive and unethical to run such an ad without a disclaimer or explanation.

6. It’s a reflection of the time value of money. TMCC gets to use the $24,099. If TMCC uses it wisely, it will be worth more than $100,000 in thirty years.

7. This will probably make the security less desirable. TMCC will only repurchase the security prior to maturity if it is to its advantage, i.e. interest rates decline. Given the drop in interest rates needed to make this viable for TMCC, it is unlikely the company will repurchase the security. This is an example of a ―call‖ feature. Such features are discussed at length in a later chapter.

8. The key considerations would be: (1) Is the rate of return implicit in the offer attractive relative to other, similar risk investments? and (2) How risky is the investment; i.e., how certain are we that we will actually get the $100,000? Thus, our answer does depend on who is making the promise to repay.

9. The Treasury security would have a somewhat higher price because the Treasury is the strongest of all borrowers.

10. The price would be higher because, as time passes, the price of the security will tend to rise toward

$100,000. This rise is just a reflection of the time value of money. As time passes, the time until receipt of the $100,000 grows shorter, and the present value rises. In 2019, the price will probably be higher for the same reason. We cannot be sure, however, because interest rates could be much higher, or TMCC’s financial position could deteriorate. Either event would tend to depress the security’s price.

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2 Solutions to Questions and Problems

NOTE: All end of chapter problems were solved using a spreadsheet. Many problems require multiple steps.

Due to space and readability constraints, when these intermediate steps are included in this solutions manual, rounding may appear to have occurred. However, the final answer for each problem is found without rounding during any step in the problem.

Basic

1. The simple interest per year is:

$5,000 × .08 = $400

So after 10 years you will have:

$400 × 10 = $4,000 in interest.

The total balance will be $5,000 + 4,000 = $9,000 With compound interest we use the future value formula:

FV = PV(1 +r)^t

FV = $5,000(1.08)¹⁰ = $10,794.62 The difference is:

$10,794.62 – 9,000 = $1,794.62 2. To find the FV of a lump sum, we use:

FV = PV(1 + r)^t

FV = $2,250(1.10)¹¹ = $ 6,419.51 FV = $8,752(1.08)⁷ = $ 14,999.39 FV = $76,355(1.17)¹⁴ = $687,764.17 FV = $183,796(1.07)⁸ = $315,795.75 3. To find the PV of a lump sum, we use:

PV = FV / (1 + r)^t

PV = $15,451 / (1.07)⁶ = $ 10,295.65 PV = $51,557 / (1.13)⁷ = $ 21,914.85 PV = $886,073 / (1.14)²³ = $ 43,516.90 PV = $550,164 / (1.09)¹⁸ = $116,631.32

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3

4. To answer this question, we can use either the FV or the PV formula. Both will give the same answer since they are the inverse of each other. We will use the FV formula, that is:

FV = PV(1 + r)^t Solving for r, we get:

r = (FV / PV)^{1 / t} – 1

FV = $297 = $240(1 + r)²; r = ($297 / $240)^1/2 – 1 = 11.24%

FV = $1,080 = $360(1 + r)¹⁰; r = ($1,080 / $360)^1/10 – 1 = 11.61%

FV = $185,382 = $39,000(1 + r)¹⁵; r = ($185,382 / $39,000)^1/15 – 1 = 10.95%

FV = $531,618 = $38,261(1 + r)³⁰; r = ($531,618 / $38,261)^1/30 – 1 = 9.17%

FV = PV(1 + r)^t Solving for t, we get:

t = ln(FV / PV) / ln(1 + r)

FV = $1,284 = $560(1.09)^t; t = ln($1,284/ $560) / ln 1.09 = 9.63 years FV = $4,341 = $810(1.10)^t; t = ln($4,341/ $810) / ln 1.10 = 17.61 years FV = $364,518 = $18,400(1.17)^t; t = ln($364,518 / $18,400) / ln 1.17 = 19.02 years FV = $173,439 = $21,500(1.15)^t; t = ln($173,439 / $21,500) / ln 1.15 = 14.94 years

r = (FV / PV)^{1 / t} – 1

r = ($290,000 / $55,000)^1/18 – 1 = .0968 or 9.68%

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7. To find the length of time for money to double, triple, etc., the present value and future value are irrelevant as long as the future value is twice the present value for doubling, three times as large for tripling, etc. To answer this question, we can use either the FV or the PV formula. Both will give the same answer since they are the inverse of each other. We will use the FV formula, that is:

t = ln(FV / PV) / ln(1 + r)

The length of time to double your money is:

FV = $2 = $1(1.07)^t

t = ln 2 / ln 1.07 = 10.24 years

The length of time to quadruple your money is:

FV = $4 = $1(1.07)^t t = ln 4 / ln 1.07 = 20.49 years

Notice that the length of time to quadruple your money is twice as long as the time needed to double your money (the difference in these answers is due to rounding). This is an important concept of time value of money.

r = (FV / PV)^{1 / t} – 1

r = ($314,600 / $200,300)^1/7 – 1 = .0666 or 6.66%

t = ln(FV / PV) / ln(1 + r)

t = ln ($170,000 / $40,000) / ln 1.053 = 28.02 years

10. To find the PV of a lump sum, we use:

PV = FV / (1 + r)^t

PV = $650,000,000 / (1.074)²⁰ = $155,893,400.13

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5 11. To find the PV of a lump sum, we use:

PV = FV / (1 + r)^t

PV = $1,000,000 / (1.10)⁸⁰ = $488.19 12. To find the FV of a lump sum, we use:

FV = PV(1 + r)^t

FV = $50(1.045)¹⁰⁵ = $5,083.71

13. To answer this question, we can use either the FV or the PV formula. Both will give the same answer since they are the inverse of each other. We will use the FV formula, that is:

r = (FV / PV)^{1 / t} – 1

r = ($1,260,000 / $150)^1/112 – 1 = .0840 or 8.40%

To find the FV of the first prize, we use:

FV = PV(1 + r)^t

FV = $1,260,000(1.0840)³³ = $18,056,409.94

r = (FV / PV)^{1 / t} – 1

r = ($43,125 / $1)^1/113 – 1 = .0990 or 9.90%

r = (FV / PV)^{1 / t} – 1

r = ($10,311,500 / $12,377,500)^1/4 – 1 = – 4.46%

Notice that the interest rate is negative. This occurs when the FV is less than the PV.

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6 Intermediate

r = (FV / PV)^{1 / t} – 1

a. PV = $100,000 / (1 + r)³⁰ = $24,099

r = ($100,000 / $24,099)^1/30 – 1 = .0486 or 4.86%

b. PV = $38,260 / (1 + r)¹² = $24,099

r = ($38,260 / $24,099)^1/12 – 1 = .0393 or 3.93%

c. PV = $100,000 / (1 + r)¹⁸ = $38,260

r = ($100,000 / $38,260)^1/18 – 1 = .0548 or 5.48%

17. To find the PV of a lump sum, we use:

PV = FV / (1 + r)^t

PV = $170,000 / (1.12)⁹ = $61,303.70 18. To find the FV of a lump sum, we use:

FV = PV(1 + r)^t

FV = $4,000(1.11)⁴⁵ = $438,120.97 FV = $4,000(1.11)³⁵ = $154,299.40 Better start early!

19. We need to find the FV of a lump sum. However, the money will only be invested for six years, so the number of periods is six.

FV = PV(1 + r)^t

FV = $20,000(1.084)⁶ = $32,449.33

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7

t = ln(FV / PV) / ln(1 + r)

t = ln($75,000 / $10,000) / ln(1.11) = 19.31

So, the money must be invested for 19.31 years. However, you will not receive the money for another two years. From now, you’ll wait:

2 years + 19.31 years = 21.31 years

Calculator Solutions

1.

Enter 10 8% $5,000

N I/Y PV PMT FV

Solve for $10,794.62

$10,794.62 – 9,000 = $1,794.62 2.

Enter 11 10% $2,250

Solve for $6,419.51

Enter 7 8% $8,752

Enter 14 17% $76,355

Solve for $687,764.17

Enter 8 7% $183,796

Solve for $315,795.75

3.

Enter 6 7% $15,451

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8

Enter 7 13% $51,557

Enter 23 14% $886,073

Enter 18 9% $550,164

Solve for $116,631.32

4.

Enter 2 $240 $297

Solve for 11.24%

Enter 10 $360 $1,080

Solve for 11.61%

Enter 15 $39,000 $185,382

Solve for 10.95%

Enter 30 $38,261 $531,618

Solve for 9.17%

5.

Enter 9% $560 $1,284

Solve for 9.63

Enter 10% $810 $4,341

Solve for 17.61

Enter 17% $18,400 $364,518

Solve for 19.02

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9

Enter 15% $21,500 $173,439

Solve for 14.94 6.

Enter 18 $55,000 $290,000

Solve for 9.68%

7.

Enter 7% $1 $2

Solve for 10.24

Enter 7% $1 $4

Solve for 20.49 8.

Enter 7 $200,300 $314,600

Solve for 6.66%

9.

Enter 5.30% $40,000 $170,000

Solve for 28.02 10.

Enter 20 7.4% $650,000,000

Solve for $155,893,400.13

11.

Enter 80 10% $1,000,000

Solve for $488.19

12.

Enter 105 4.50% $50

Solve for $5,083.71

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10 13.

Enter 112 $150 $1,260,000

Solve for 8.40%

Enter 33 8.40% $1,260,000

Solve for $18,056,404.94

14.

Enter 113 $1 ±$43,125

Solve for 9.90%

15.

Enter 4 $12,377,500 $10,311,500

Solve for –4.46%

16. a.

Enter 30 $24,099 $100,000

Solve for 4.86%

16. b.

Enter 12 $24,099 $38,260

Solve for 3.93%

16. c.

Enter 18 $38,260 $100,000

Solve for 5.48%

17.

Enter 9 12% $170,000

18.

Enter 45 11% $4,000

Solve for $438,120.97

Enter 35 11% $4,000

Solve for $154,299.40

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11 19.

Enter 6 8.40% $20,000

20.

Enter 11% $10,000 $75,000

Solve for 19.31

From now, you’ll wait 2 + 19.31 = 21.31 years

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CHAPTER 6 DISCOUNTED CASH FLOW VALUATION

Answers to Concepts Review and Critical Thinking Questions

1. The four pieces are the present value (PV), the periodic cash flow (C), the discount rate (r), and the number of payments, or the life of the annuity, t.

2. Assuming positive cash flows, both the present and the future values will rise.

3. Assuming positive cash flows, the present value will fall and the future value will rise.

4. It’s deceptive, but very common. The basic concept of time value of money is that a dollar today is not worth the same as a dollar tomorrow. The deception is particularly irritating given that such lotteries are usually government sponsored!

5. If the total money is fixed, you want as much as possible as soon as possible. The team (or, more accurately, the team owner) wants just the opposite.

6. The better deal is the one with equal installments.

7. Yes, they should. APRs generally don’t provide the relevant rate. The only advantage is that they are easier to compute, but, with modern computing equipment, that advantage is not very important.

8. A freshman does. The reason is that the freshman gets to use the money for much longer before interest starts to accrue. The subsidy is the present value (on the day the loan is made) of the interest that would have accrued up until the time it actually begins to accrue.

9. The problem is that the subsidy makes it easier to repay the loan, not obtain it. However, ability to repay the loan depends on future employment, not current need. For example, consider a student who is currently needy, but is preparing for a career in a high-paying area (such as corporate finance!). Should this student receive the subsidy? How about a student who is currently not needy, but is preparing for a relatively low-paying job (such as becoming a college professor)?

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10. In general, viatical settlements are ethical. In the case of a viatical settlement, it is simply an exchange of cash today for payment in the future, although the payment depends on the death of the seller. The purchaser of the life insurance policy is bearing the risk that the insured individual will live longer than expected. Although viatical settlements are ethical, they may not be the best choice for an individual. In a Business Week article (October 31, 2005), options were examined for a 72 year old male with a life expectancy of 8 years and a $1 million dollar life insurance policy with an annual premium of $37,000. The four options were: 1) Cash the policy today for $100,000. 2) Sell the policy in a viatical settlement for $275,000. 3) Reduce the death benefit to $375,000, which would keep the policy in force for 12 years without premium payments. 4) Stop paying premiums and don’t reduce the death benefit. This will run the cash value of the policy to zero in 5 years, but the viatical settlement would be worth $475,000 at that time. If he died within 5 years, the beneficiaries would receive $1 million. Ultimately, the decision rests on the individual on what they perceive as best for themselves. The values that will affect the value of the viatical settlement are the discount rate, the face value of the policy, and the health of the individual selling the policy.

Solutions to Questions and Problems

NOTE: All end of chapter problems were solved using a spreadsheet. Many problems require multiple steps. Due to space and readability constraints, when these intermediate steps are included in this solutions manual, rounding may appear to have occurred. However, the final answer for each problem is found without rounding during any step in the problem.

Basic

1. To solve this problem, we must find the PV of each cash flow and add them. To find the PV of a lump sum, we use:

PV = FV / (1 + r)^t

PV@10% = $950 / 1.10 + $1,040 / 1.10² + $1,130 / 1.10³ + $1,075 / 1.10⁴ = $3,306.37 PV@18% = $950 / 1.18 + $1,040 / 1.18² + $1,130 / 1.18³ + $1,075 / 1.18⁴ = $2,794.22 PV@24% = $950 / 1.24 + $1,040 / 1.24² + $1,130 / 1.24³ + $1,075 / 1.24⁴ = $2,489.88

2. To find the PVA, we use the equation:

PVA = C({1 – [1/(1 + r)]^t } / r ) At a 5 percent interest rate:

X@5%: PVA = $6,000{[1 – (1/1.05)⁹ ] / .05 } = $42,646.93 Y@5%: PVA = $8,000{[1 – (1/1.05)⁶ ] / .05 } = $40,605.54

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14 And at a 15 percent interest rate:

X@15%: PVA = $6,000{[1 – (1/1.15)⁹ ] / .15 } = $28,629.50 Y@15%: PVA = $8,000{[1 – (1/1.15)⁶ ] / .15 } = $30,275.86

Notice that the PV of cash flow X has a greater PV at a 5 percent interest rate, but a lower PV at a 15 percent interest rate. The reason is that X has greater total cash flows. At a lower interest rate, the total cash flow is more important since the cost of waiting (the interest rate) is not as great. At a higher interest rate, Y is more valuable since it has larger cash flows. At the higher interest rate, these bigger cash flows early are more important since the cost of waiting (the interest rate) is so much greater.

3. To solve this problem, we must find the FV of each cash flow and add them. To find the FV of a lump sum, we use:

FV = PV(1 + r)^t

FV@8% = $940(1.08)³ + $1,090(1.08)² + $1,340(1.08) + $1,405 = $5,307.71 FV@11% = $940(1.11)³ + $1,090(1.11)² + $1,340(1.11) + $1,405 = $5,520.96 FV@24% = $940(1.24)³ + $1,090(1.24)² + $1,340(1.24) + $1,405 = $6,534.81

Notice we are finding the value at Year 4, the cash flow at Year 4 is simply added to the FV of the other cash flows. In other words, we do not need to compound this cash flow.

PVA = C({1 – [1/(1 + r)]^t } / r )

PVA@15 yrs: PVA = $5,300{[1 – (1/1.07)¹⁵ ] / .07} = $48,271.94 PVA@40 yrs: PVA = $5,300{[1 – (1/1.07)⁴⁰ ] / .07} = $70,658.06 PVA@75 yrs: PVA = $5,300{[1 – (1/1.07)⁷⁵ ] / .07} = $75,240.70 To find the PV of a perpetuity, we use the equation:

PV = C / r

PV = $5,300 / .07 = $75,714.29

Notice that as the length of the annuity payments increases, the present value of the annuity approaches the present value of the perpetuity. The present value of the 75 year annuity and the present value of the perpetuity imply that the value today of all perpetuity payments beyond 75 years is only $473.59.

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5. Here we have the PVA, the length of the annuity, and the interest rate. We want to calculate the annuity payment. Using the PVA equation:

PVA = C({1 – [1/(1 + r)]^t } / r )

PVA = $34,000 = $C{[1 – (1/1.0765)¹⁵ ] / .0765}

We can now solve this equation for the annuity payment. Doing so, we get:

C = $34,000 / 8.74548 = $3,887.72

PVA = C({1 – [1/(1 + r)]^t } / r )

PVA = $73,000{[1 – (1/1.085)⁸ ] / .085} = $411,660.36

7. Here we need to find the FVA. The equation to find the FVA is:

FVA = C{[(1 + r)^t – 1] / r}

FVA for 20 years = $4,000[(1.112²⁰ – 1) / .112] = $262,781.16 FVA for 40 years = $4,000[(1.112⁴⁰ – 1) / .112] = $2,459,072.63

Notice that because of exponential growth, doubling the number of periods does not merely double the FVA.

8. Here we have the FVA, the length of the annuity, and the interest rate. We want to calculate the annuity payment. Using the FVA equation:

FVA = C{[(1 + r)^t – 1] / r}

$90,000 = $C[(1.068¹⁰ – 1) / .068]

C = $90,000 / 13.68662 = $6,575.77

9. Here we have the PVA, the length of the annuity, and the interest rate. We want to calculate the annuity payment. Using the PVA equation:

PVA = C({1 – [1/(1 + r)]^t } / r)

$50,000 = C{[1 – (1/1.075)⁷ ] / .075}

C = $50,000 / 5.29660 = $9,440.02

10. This cash flow is a perpetuity. To find the PV of a perpetuity, we use the equation:

PV = C / r

PV = $25,000 / .072 = $347,222.22

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11. Here we need to find the interest rate that equates the perpetuity cash flows with the PV of the cash flows.

Using the PV of a perpetuity equation:

PV = C / r

$375,000 = $25,000 / r

We can now solve for the interest rate as follows:

r = $25,000 / $375,000 = .0667 or 6.67%

12. For discrete compounding, to find the EAR, we use the equation:

EAR = [1 + (APR / m)]^m – 1

EAR = [1 + (.08 / 4)]⁴ – 1 = .0824 or 8.24%

EAR = [1 + (.16 / 12)]¹² – 1 = .1723 or 17.23%

EAR = [1 + (.12 / 365)]³⁶⁵ – 1 = .1275 or 12.75%

To find the EAR with continuous compounding, we use the equation:

EAR = e^q – 1

EAR = e^.15 – 1 = .1618 or 16.18%

13. Here we are given the EAR and need to find the APR. Using the equation for discrete compounding:

EAR = [1 + (APR / m)]^m – 1

We can now solve for the APR. Doing so, we get:

APR = m[(1 + EAR)^1/m – 1]

EAR = .0860 = [1 + (APR / 2)]² – 1 APR = 2[(1.0860)^1/2 – 1] = .0842 or 8.42%

EAR = .1980 = [1 + (APR / 12)]¹² – 1 APR = 12[(1.1980)^1/12 – 1] = .1820 or 18.20%

EAR = .0940 = [1 + (APR / 52)]⁵² – 1 APR = 52[(1.0940)^1/52 – 1] = .0899 or 8.99%

Solving the continuous compounding EAR equation:

EAR = e^q – 1 We get:

APR = ln(1 + EAR) APR = ln(1 + .1650) APR = .1527 or 15.27%

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14. For discrete compounding, to find the EAR, we use the equation:

EAR = [1 + (APR / m)]^m – 1 So, for each bank, the EAR is:

First National: EAR = [1 + (.1420 / 12)]¹² – 1 = .1516 or 15.16%

First United: EAR = [1 + (.1450 / 2)]² – 1 = .1503 or 15.03%

Notice that the higher APR does not necessarily mean the higher EAR. The number of compounding periods within a year will also affect the EAR.

15. The reported rate is the APR, so we need to convert the EAR to an APR as follows:

EAR = [1 + (APR / m)]^m – 1 APR = m[(1 + EAR)^1/m – 1]

APR = 365[(1.16)^1/365 – 1] = .1485 or 14.85%

This is deceptive because the borrower is actually paying annualized interest of 16% per year, not the 14.85%

reported on the loan contract.

16. For this problem, we simply need to find the FV of a lump sum using the equation:

FV = PV(1 + r)^t

It is important to note that compounding occurs semiannually. To account for this, we will divide the interest rate by two (the number of compounding periods in a year), and multiply the number of periods by two.

Doing so, we get:

FV = $2,100[1 + (.084/2)]³⁴ = $8,505.93

17. For this problem, we simply need to find the FV of a lump sum using the equation:

FV = PV(1 + r)^t

It is important to note that compounding occurs daily. To account for this, we will divide the interest rate by 365 (the number of days in a year, ignoring leap year), and multiply the number of periods by 365. Doing so, we get:

FV in 5 years = $4,500[1 + (.093/365)]⁵⁽³⁶⁵⁾ = $7,163.64 FV in 10 years = $4,500[1 + (.093/365)]^10(365) = $11,403.94 FV in 20 years = $4,500[1 + (.093/365)]^20(365) = $28,899.97

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18. For this problem, we simply need to find the PV of a lump sum using the equation:

PV = FV / (1 + r)^t

It is important to note that compounding occurs daily. To account for this, we will divide the interest rate by 365 (the number of days in a year, ignoring leap year), and multiply the number of periods by 365. Doing so, we get:

PV = $58,000 / [(1 + .10/365)⁷⁽³⁶⁵⁾] = $28,804.71

19. The APR is simply the interest rate per period times the number of periods in a year. In this case, the interest rate is 30 percent per month, and there are 12 months in a year, so we get:

APR = 12(30%) = 360%

To find the EAR, we use the EAR formula:

EAR = [1 + (APR / m)]^m – 1 EAR = (1 + .30)¹² – 1 = 2,229.81%

Notice that we didn’t need to divide the APR by the number of compounding periods per year. We do this division to get the interest rate per period, but in this problem we are already given the interest rate per period.

20. We first need to find the annuity payment. We have the PVA, the length of the annuity, and the interest rate.

Using the PVA equation:

PVA = C({1 – [1/(1 + r)]^t } / r)

$68,500 = $C[1 – {1 / [1 + (.069/12)]⁶⁰} / (.069/12)]

Solving for the payment, we get:

C = $68,500 / 50.622252 = $1,353.15 To find the EAR, we use the EAR equation:

EAR = [1 + (APR / m)]^m – 1

EAR = [1 + (.069 / 12)]¹² – 1 = .0712 or 7.12%

21. Here we need to find the length of an annuity. We know the interest rate, the PV, and the payments. Using the PVA equation:

PVA = C({1 – [1/(1 + r)]^t } / r)

$18,000 = $500{[1 – (1/1.013)^t ] / .013}

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19 Now we solve for t:

1/1.013^t = 1 – {[($18,000)/($500)](.013)}

1/1.013^t = 0.532

1.013^t= 1/(0.532) = 1.8797

t = ln 1.8797 / ln 1.013 = 48.86 months

22. Here we are trying to find the interest rate when we know the PV and FV. Using the FV equation:

FV = PV(1 + r)

$4 = $3(1 + r)

r = 4/3 – 1 = 33.33% per week

The interest rate is 33.33% per week. To find the APR, we multiply this rate by the number of weeks in a year, so:

APR = (52)33.33% = 1,733.33%

And using the equation to find the EAR:

EAR = [1 + (APR / m)]^m – 1

EAR = [1 + .3333]⁵² – 1 = 313,916,515.69%

23. Here we need to find the interest rate that equates the perpetuity cash flows with the PV of the cash flows.

Using the PV of a perpetuity equation:

PV = C / r

$95,000 = $1,800 / r

We can now solve for the interest rate as follows:

r = $1,800 / $95,000 = .0189 or 1.89% per month

The interest rate is 1.89% per month. To find the APR, we multiply this rate by the number of months in a year, so:

APR = (12)1.89% = 22.74%

And using the equation to find an EAR:

EAR = [1 + (APR / m)]^m – 1 EAR = [1 + .0189]¹² – 1 = 25.26%

24. This problem requires us to find the FVA. The equation to find the FVA is:

FVA = C{[(1 + r)^t – 1] / r}

FVA = $300[{[1 + (.10/12) ]³⁶⁰– 1} / (.10/12)] = $678,146.38

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20

25. In the previous problem, the cash flows are monthly and the compounding period is monthly. This assumption still holds. Since the cash flows are annual, we need to use the EAR to calculate the future value of annual cash flows. It is important to remember that you have to make sure the compounding periods of the interest rate is the same as the timing of the cash flows. In this case, we have annual cash flows, so we need the EAR since it is the true annual interest rate you will earn. So, finding the EAR:

EAR = [1 + (APR / m)]^m – 1

EAR = [1 + (.10/12)]¹² – 1 = .1047 or 10.47%

Using the FVA equation, we get:

FVA = C{[(1 + r)^t – 1] / r}

FVA = $3,600[(1.1047³⁰ – 1) / .1047] = $647,623.45

26. The cash flows are simply an annuity with four payments per year for four years, or 16 payments. We can use the PVA equation:

PVA = C({1 – [1/(1 + r)]^t } / r)

PVA = $2,300{[1 – (1/1.0065)¹⁶] / .0065} = $34,843.71

27. The cash flows are annual and the compounding period is quarterly, so we need to calculate the EAR to make the interest rate comparable with the timing of the cash flows. Using the equation for the EAR, we get:

EAR = [1 + (APR / m)]^m – 1

EAR = [1 + (.11/4)]⁴ – 1 = .1146 or 11.46%

And now we use the EAR to find the PV of each cash flow as a lump sum and add them together:

PV = $725 / 1.1146 + $980 / 1.1146² + $1,360 / 1.1146⁴ = $2,320.36

28. Here the cash flows are annual and the given interest rate is annual, so we can use the interest rate given. We simply find the PV of each cash flow and add them together.

PV = $1,650 / 1.0845 + $4,200 / 1.0845³ + $2,430 / 1.0845⁴ = $6,570.86 Intermediate

29. The total interest paid by First Simple Bank is the interest rate per period times the number of periods. In other words, the interest by First Simple Bank paid over 10 years will be:

.07(10) = .7

First Complex Bank pays compound interest, so the interest paid by this bank will be the FV factor of $1, or:

(1 + r)¹⁰

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21 Setting the two equal, we get:

(.07)(10) = (1 + r)¹⁰ – 1 r = 1.7^1/10 – 1 = .0545 or 5.45%

30. Here we need to convert an EAR into interest rates for different compounding periods. Using the equation for the EAR, we get:

EAR = [1 + (APR / m)]^m – 1

EAR = .17 = (1 + r)²– 1; r = (1.17)^1/2 – 1 = .0817 or 8.17% per six months EAR = .17 = (1 + r)⁴– 1; r = (1.17)^1/4 – 1 = .0400 or 4.00% per quarter EAR = .17 = (1 + r)¹²– 1; r = (1.17)^1/12 – 1 = .0132 or 1.32% per month

Notice that the effective six month rate is not twice the effective quarterly rate because of the effect of compounding.

31. Here we need to find the FV of a lump sum, with a changing interest rate. We must do this problem in two parts. After the first six months, the balance will be:

FV = $5,000 [1 + (.015/12)]⁶ = $5,037.62

This is the balance in six months. The FV in another six months will be:

FV = $5,037.62[1 + (.18/12)]⁶ = $5,508.35

The problem asks for the interest accrued, so, to find the interest, we subtract the beginning balance from the FV. The interest accrued is:

Interest = $5,508.35 – 5,000.00 = $508.35

32. We need to find the annuity payment in retirement. Our retirement savings ends and the retirement withdrawals begin, so the PV of the retirement withdrawals will be the FV of the retirement savings. So, we find the FV of the stock account and the FV of the bond account and add the two FVs.

Stock account: FVA = $700[{[1 + (.11/12) ]³⁶⁰– 1} / (.11/12)] = $1,963,163.82 Bond account: FVA = $300[{[1 + (.06/12) ]³⁶⁰– 1} / (.06/12)] = $301,354.51 So, the total amount saved at retirement is:

$1,963,163.82 + 301,354.51 = $2,264,518.33

Solving for the withdrawal amount in retirement using the PVA equation gives us:

PVA = $2,264,518.33 = $C[1 – {1 / [1 + (.09/12)]³⁰⁰} / (.09/12)]

C = $2,264,518.33 / 119.1616 = $19,003.763 withdrawal per month

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22

33. We need to find the FV of a lump sum in one year and two years. It is important that we use the number of months in compounding since interest is compounded monthly in this case. So:

FV in one year = $1(1.0117)¹² = $1.15 FV in two years = $1(1.0117)²⁴ = $1.32

There is also another common alternative solution. We could find the EAR, and use the number of years as our compounding periods. So we will find the EAR first:

EAR = (1 + .0117)¹² – 1 = .1498 or 14.98%

Using the EAR and the number of years to find the FV, we get:

FV in one year = $1(1.1498)¹ = $1.15 FV in two years = $1(1.1498)² = $1.32

Either method is correct and acceptable. We have simply made sure that the interest compounding period is the same as the number of periods we use to calculate the FV.

34. Here we are finding the annuity payment necessary to achieve the same FV. The interest rate given is a 12 percent APR, with monthly deposits. We must make sure to use the number of months in the equation. So, using the FVA equation:

Starting today:

FVA = C[{[1 + (.12/12) ]⁴⁸⁰– 1} / (.12/12)]

C = $1,000,000 / 11,764.77 = $85.00

Starting in 10 years:

FVA = C[{[1 + (.12/12) ]³⁶⁰– 1} / (.12/12)]

C = $1,000,000 / 3,494.96 = $286.13

Starting in 20 years:

FVA = C[{[1 + (.12/12) ]²⁴⁰– 1} / (.12/12)]

C = $1,000,000 / 989.255 = $1,010.86

Notice that a deposit for half the length of time, i.e. 20 years versus 40 years, does not mean that the annuity payment is doubled. In this example, by reducing the savings period by one-half, the deposit necessary to achieve the same ending value is about twelve times as large.

35. Since we are looking to quadruple our money, the PV and FV are irrelevant as long as the FV is three times as large as the PV. The number of periods is four, the number of quarters per year. So:

FV = $3 = $1(1 + r)^(12/3) r = .3161 or 31.61%

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23

36. Since we have an APR compounded monthly and an annual payment, we must first convert the interest rate to an EAR so that the compounding period is the same as the cash flows.

EAR = [1 + (.10 / 12)]¹² – 1 = .104713 or 10.4713%

PVA1 = $95,000 {[1 – (1 / 1.104713)²] / .104713} = $163,839.09

PVA2 = $45,000 + $70,000{[1 – (1/1.104713)²] / .104713} = $165,723.54 You would choose the second option since it has a higher PV.

37. We can use the present value of a growing perpetuity equation to find the value of your deposits today. Doing so, we find:

PV = C {[1/(r – g)] – [1/(r – g)] × [(1 + g)/(1 + r)]^t}

PV = $1,000,000{[1/(.08 – .05)] – [1/(.08 – .05)] × [(1 + .05)/(1 + .08)]³⁰} PV = $19,016,563.18

38. Since your salary grows at 4 percent per year, your salary next year will be:

Next year’s salary = $50,000 (1 + .04) Next year’s salary = $52,000

This means your deposit next year will be:

Next year’s deposit = $52,000(.05) Next year’s deposit = $2,600

Since your salary grows at 4 percent, you deposit will also grow at 4 percent. We can use the present value of a growing perpetuity equation to find the value of your deposits today. Doing so, we find:

PV = C {[1/(r – g)] – [1/(r – g)] × [(1 + g)/(1 + r)]^t}

PV = $2,600{[1/(.11 – .04)] – [1/(.11 – .04)] × [(1 + .04)/(1 + .11)]⁴⁰} PV = $34,399.45

Now, we can find the future value of this lump sum in 40 years. We find:

FV = PV(1 + r)^t

FV = $34,366.45(1 + .11)⁴⁰ FV = $2,235,994.31

This is the value of your savings in 40 years.

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24 39. The relationship between the PVA and the interest rate is:

PVA falls as r increases, and PVA rises as r decreases FVA rises as r increases, and FVA falls as r decreases

The present values of $9,000 per year for 10 years at the various interest rates given are:

PVA@10% = $9,000{[1 – (1/1.10)¹⁵] / .10} = $68,454.72 PVA@5% = $9,000{[1 – (1/1.05)¹⁵] / .05} = $93,416.92 PVA@15% = $9,000{[1 – (1/1.15)¹⁵] / .15} = $52,626.33

40. Here we are given the FVA, the interest rate, and the amount of the annuity. We need to solve for the number of payments. Using the FVA equation:

FVA = $20,000 = $340[{[1 + (.06/12)]^t – 1 } / (.06/12)]

Solving for t, we get:

1.005^t = 1 + [($20,000)/($340)](.06/12) t = ln 1.294118 / ln 1.005 = 51.69 payments

41. Here we are given the PVA, number of periods, and the amount of the annuity. We need to solve for the interest rate. Using the PVA equation:

PVA = $73,000 = $1,450[{1 – [1 / (1 + r)]⁶⁰}/ r]

To find the interest rate, we need to solve this equation on a financial calculator, using a spreadsheet, or by trial and error. If you use trial and error, remember that increasing the interest rate lowers the PVA, and decreasing the interest rate increases the PVA. Using a spreadsheet, we find:

r = 0.594%

The APR is the periodic interest rate times the number of periods in the year, so:

APR = 12(0.594%) = 7.13%

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25

42. The amount of principal paid on the loan is the PV of the monthly payments you make. So, the present value of the $1,150 monthly payments is:

PVA = $1,150[(1 – {1 / [1 + (.0635/12)]}³⁶⁰) / (.0635/12)] = $184,817.42

The monthly payments of $1,150 will amount to a principal payment of $184,817.42. The amount of principal you will still owe is:

$240,000 – 184,817.42 = $55,182.58

This remaining principal amount will increase at the interest rate on the loan until the end of the loan period.

So the balloon payment in 30 years, which is the FV of the remaining principal will be:

Balloon payment = $55,182.58[1 + (.0635/12)]³⁶⁰ = $368,936.54

43. We are given the total PV of all four cash flows. If we find the PV of the three cash flows we know, and subtract them from the total PV, the amount left over must be the PV of the missing cash flow. So, the PV of the cash flows we know are:

PV of Year 1 CF: $1,700 / 1.10 = $1,545.45 PV of Year 3 CF: $2,100 / 1.10³ = $1,577.76 PV of Year 4 CF: $2,800 / 1.10⁴ = $1,912.44 So, the PV of the missing CF is:

$6,550 – 1,545.45 – 1,577.76 – 1,912.44 = $1,514.35

The question asks for the value of the cash flow in Year 2, so we must find the future value of this amount. The value of the missing CF is:

$1,514.35(1.10)² = $1,832.36

44. To solve this problem, we simply need to find the PV of each lump sum and add them together. It is important to note that the first cash flow of $1 million occurs today, so we do not need to discount that cash flow. The PV of the lottery winnings is:

PV = $1,000,000 + $1,500,000/1.09 + $2,000,000/1.09² + $2,500,000/1.09³ + $3,000,000/1.09⁴ + $3,500,000/1.09⁵ + $4,000,000/1.09⁶ + $4,500,000/1.09⁷ + $5,000,000/1.09⁸ + $5,500,000/1.09⁹ + $6,000,000/1.09¹⁰

PV = $22,812,873.40

45. Here we are finding interest rate for an annuity cash flow. We are given the PVA, number of periods, and the amount of the annuity. We should also note that the PV of the annuity is not the amount borrowed since we are making a down payment on the warehouse. The amount borrowed is:

Amount borrowed = 0.80($2,900,000) = $2,320,000

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26 Using the PVA equation:

PVA = $2,320,000 = $15,000[{1 – [1 / (1 + r)]³⁶⁰}/ r]

Unfortunately this equation cannot be solved to find the interest rate using algebra. To find the interest rate, we need to solve this equation on a financial calculator, using a spreadsheet, or by trial and error. If you use trial and error, remember that increasing the interest rate lowers the PVA, and decreasing the interest rate increases the PVA. Using a spreadsheet, we find:

r = 0.560%

The APR is the monthly interest rate times the number of months in the year, so:

APR = 12(0.560%) = 6.72%

And the EAR is:

EAR = (1 + .00560)¹² – 1 = .0693 or 6.93%

46. The profit the firm earns is just the PV of the sales price minus the cost to produce the asset. We find the PV of the sales price as the PV of a lump sum:

PV = $165,000 / 1.13⁴ = $101,197.59 And the firm’s profit is:

Profit = $101,197.59 – 94,000.00 = $7,197.59

To find the interest rate at which the firm will break even, we need to find the interest rate using the PV (or FV) of a lump sum. Using the PV equation for a lump sum, we get:

$94,000 = $165,000 / ( 1 + r)⁴

r = ($165,000 / $94,000)^1/4 – 1 = .1510 or 15.10%

47. We want to find the value of the cash flows today, so we will find the PV of the annuity, and then bring the lump sum PV back to today. The annuity has 18 payments, so the PV of the annuity is:

PVA = $4,000{[1 – (1/1.10)¹⁸] / .10} = $32,805.65

Since this is an ordinary annuity equation, this is the PV one period before the first payment, so it is the PV at t = 7. To find the value today, we find the PV of this lump sum. The value today is:

PV = $32,805.65 / 1.10⁷ = $16,834.48

48. This question is asking for the present value of an annuity, but the interest rate changes during the life of the annuity. We need to find the present value of the cash flows for the last eight years first. The PV of these cash flows is:

PVA2 = $1,500 [{1 – 1 / [1 + (.07/12)]⁹⁶} / (.07/12)] = $110,021.35

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27

Note that this is the PV of this annuity exactly seven years from today. Now we can discount this lump sum to today. The value of this cash flow today is:

PV = $110,021.35 / [1 + (.11/12)]⁸⁴ = $51,120.33

Now we need to find the PV of the annuity for the first seven years. The value of these cash flows today is:

PVA1 = $1,500 [{1 – 1 / [1 + (.11/12)]⁸⁴} / (.11/12)] = $87,604.36 The value of the cash flows today is the sum of these two cash flows, so:

PV = $51,120.33 + 87,604.36 = $138,724.68

49. Here we are trying to find the dollar amount invested today that will equal the FVA with a known interest rate, and payments. First we need to determine how much we would have in the annuity account. Finding the FV of the annuity, we get:

FVA = $1,200 [{[ 1 + (.085/12)]¹⁸⁰ – 1} / (.085/12)] = $434,143.62

Now we need to find the PV of a lump sum that will give us the same FV. So, using the FV of a lump sum with continuous compounding, we get:

FV = $434,143.62 = PVe^.08(15) PV = $434,143.62e^–1.20 = $130,761.55

50. To find the value of the perpetuity at t = 7, we first need to use the PV of a perpetuity equation. Using this equation we find:

PV = $3,500 / .062 = $56,451.61

Remember that the PV of a perpetuity (and annuity) equations give the PV one period before the first payment, so, this is the value of the perpetuity at t = 14. To find the value at t = 7, we find the PV of this lump sum as:

PV = $56,451.61 / 1.062⁷ = $37,051.41

51. To find the APR and EAR, we need to use the actual cash flows of the loan. In other words, the interest rate quoted in the problem is only relevant to determine the total interest under the terms given. The interest rate for the cash flows of the loan is:

PVA = $25,000 = $2,416.67{(1 – [1 / (1 + r)]¹² ) / r }

Again, we cannot solve this equation for r, so we need to solve this equation on a financial calculator, using a spreadsheet, or by trial and error. Using a spreadsheet, we find:

r = 2.361% per month

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28 So the APR is:

APR = 12(2.361%) = 28.33%

And the EAR is:

EAR = (1.02361)¹² – 1 = .3231 or 32.31%

52. The cash flows in this problem are semiannual, so we need the effective semiannual rate. The interest rate given is the APR, so the monthly interest rate is:

Monthly rate = .10 / 12 = .00833

To get the semiannual interest rate, we can use the EAR equation, but instead of using 12 months as the exponent, we will use 6 months. The effective semiannual rate is:

Semiannual rate = (1.00833)⁶ – 1 = .0511 or 5.11%

We can now use this rate to find the PV of the annuity. The PV of the annuity is:

PVA @ year 8: $7,000{[1 – (1 / 1.0511)¹⁰] / .0511} = $53,776.72

Note, this is the value one period (six months) before the first payment, so it is the value at year 8. So, the value at the various times the questions asked for uses this value 8 years from now.

PV @ year 5: $53,776.72 / 1.0511⁶ = $39,888.33

Note, you can also calculate this present value (as well as the remaining present values) using the number of years. To do this, you need the EAR. The EAR is:

EAR = (1 + .0083)¹² – 1 = .1047 or 10.47%

So, we can find the PV at year 5 using the following method as well:

PV @ year 5: $53,776.72 / 1.1047³ = $39,888.33

The value of the annuity at the other times in the problem is:

PV @ year 3: $53,776.72 / 1.0511¹⁰ = $32,684.88 PV @ year 3: $53,776.72 / 1.1047⁵ = $32,684.88 PV @ year 0: $53,776.72 / 1.0511¹⁶ = $24,243.67 PV @ year 0: $53,776.72 / 1.1047⁸ = $24,243.67

53. a. If the payments are in the form of an ordinary annuity, the present value will be:

PVA = C({1 – [1/(1 + r)^t]} / r ))

PVA = $10,000[{1 – [1 / (1 + .11)]⁵}/ .11]

PVA = $36,958.97

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29

If the payments are an annuity due, the present value will be:

PVAdue = (1 + r) PVA

PVAdue = (1 + .11)$36,958.97 PVAdue = $41,024.46

b. We can find the future value of the ordinary annuity as:

FVA = C{[(1 + r)^t – 1] / r}

FVA = $10,000{[(1 + .11)⁵ – 1] / .11}

FVA = $62,278.01

If the payments are an annuity due, the future value will be:

FVAdue = (1 + r) FVA

FVAdue = (1 + .11)$62,278.01 FVAdue = $69,128.60

c. Assuming a positive interest rate, the present value of an annuity due will always be larger than the present value of an ordinary annuity. Each cash flow in an annuity due is received one period earlier, which means there is one period less to discount each cash flow. Assuming a positive interest rate, the future value of an ordinary due will always higher than the future value of an ordinary annuity. Since each cash flow is made one period sooner, each cash flow receives one extra period of compounding.

54. We need to use the PVA due equation, that is:

PVAdue = (1 + r) PVA Using this equation:

PVAdue = $68,000 = [1 + (.0785/12)] × C[{1 – 1 / [1 + (.0785/12)]⁶⁰} / (.0785/12)

$67,558.06 = $C{1 – [1 / (1 + .0785/12)⁶⁰]} / (.0785/12) C = $1,364.99

Notice, to find the payment for the PVA due we simply compound the payment for an ordinary annuity forward one period.

55. The payment for a loan repaid with equal payments is the annuity payment with the loan value as the PV of the annuity. So, the loan payment will be:

PVA = $42,000 = C {[1 – 1 / (1 + .08)⁵] / .08}

C = $10,519.17

The interest payment is the beginning balance times the interest rate for the period, and the principal payment is the total payment minus the interest payment. The ending balance is the beginning balance minus the principal payment. The ending balance for a period is the beginning balance for the next period. The amortization table for an equal payment is:

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30 Year

Beginning Balance

Total Payment

Interest Payment

Principal Payment

Ending Balance 1 $42,000.00 $10,519.17 $3,360.00 $7,159.17 $34,840.83

2 34,840.83 10,519.17 2,787.27 7,731.90 27,108.92

3 27,108.92 10,519.17 2,168.71 8,350.46 18,758.47

4 18,758.47 10,519.17 1,500.68 9,018.49 9,739.97

5 9,739.97 10,519.17 779.20 9,739.97 0.00

In the third year, $2,168.71 of interest is paid.

Total interest over life of the loan = $3,360 + 2,787.27 + 2,168.71 + 1,500.68 + 779.20 Total interest over life of the loan = $10,595.86

56. This amortization table calls for equal principal payments of $8,400 per year. The interest payment is the beginning balance times the interest rate for the period, and the total payment is the principal payment plus the interest payment. The ending balance for a period is the beginning balance for the next period. The amortization table for an equal principal reduction is:

Year

Beginning Balance

Total Payment

Interest Payment

Principal Payment

Ending Balance 1 $42,000.00 $11,760.00 $3,360.00 $8,400.00 $33,600.00

2 33,600.00 11,088.00 2,688.00 8,400.00 25,200.00

3 25,200.00 10,416.00 2,016.00 8,400.00 16,800.00

4 16,800.00 9,744.00 1,344.00 8,400.00 8,400.00

5 8,400.00 9,072.00 672.00 8,400.00 0.00

In the third year, $2,016 of interest is paid.

Total interest over life of the loan = $3,360 + 2,688 + 2,016 + 1,344 + 672 = $10,080

Notice that the total payments for the equal principal reduction loan are lower. This is because more principal is repaid early in the loan, which reduces the total interest expense over the life of the loan.

Challenge

57. The cash flows for this problem occur monthly, and the interest rate given is the EAR. Since the cash flows occur monthly, we must get the effective monthly rate. One way to do this is to find the APR based on monthly compounding, and then divide by 12. So, the pre-retirement APR is:

EAR = .10 = [1 + (APR / 12)]¹² – 1; APR = 12[(1.10)^1/12 – 1] = .0957 or 9.57%

And the post-retirement APR is:

EAR = .07 = [1 + (APR / 12)]¹² – 1; APR = 12[(1.07)^1/12 – 1] = .0678 or 6.78%

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31

First, we will calculate how much he needs at retirement. The amount needed at retirement is the PV of the monthly spending plus the PV of the inheritance. The PV of these two cash flows is:

PVA = $20,000{1 – [1 / (1 + .0678/12)¹²⁽²⁵⁾]} / (.0678/12) = $2,885,496.45 PV = $900,000 / [1 + (.0678/12)]³⁰⁰ = $165,824.26

So, at retirement, he needs:

$2,885,496.45 + 165,824.26 = $3,051,320.71

He will be saving $2,500 per month for the next 10 years until he purchases the cabin. The value of his savings after 10 years will be:

FVA = $2,500[{[ 1 + (.0957/12)]¹²⁽¹⁰⁾ – 1} / (.0957/12)] = $499,659.64 After he purchases the cabin, the amount he will have left is:

$499,659.64 – 380,000 = $119,659.64

He still has 20 years until retirement. When he is ready to retire, this amount will have grown to:

FV = $119,659.64[1 + (.0957/12)]¹²⁽²⁰⁾ = $805,010.23

So, when he is ready to retire, based on his current savings, he will be short:

$3,051,320.71 – 805,010.23 = $2,246,310.48

This amount is the FV of the monthly savings he must make between years 10 and 30. So, finding the annuity payment using the FVA equation, we find his monthly savings will need to be:

FVA = $2,246,310.48 = C[{[ 1 + (.1048/12)]¹²⁽²⁰⁾ – 1} / (.1048/12)]

C = $3,127.44

58. To answer this question, we should find the PV of both options, and compare them. Since we are purchasing the car, the lowest PV is the best option. The PV of the leasing is simply the PV of the lease payments, plus the $99. The interest rate we would use for the leasing option is the same as the interest rate of the loan. The PV of leasing is:

PV = $99 + $450{1 – [1 / (1 + .07/12)¹²⁽³⁾]} / (.07/12) = $14,672.91

The PV of purchasing the car is the current price of the car minus the PV of the resale price. The PV of the resale price is:

PV = $23,000 / [1 + (.07/12)]¹²⁽³⁾ = $18,654.82 The PV of the decision to purchase is:

$32,000 – 18,654.82 = $13,345.18

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32

In this case, it is cheaper to buy the car than leasing it since the PV of the purchase cash flows is lower. To find the breakeven resale price, we need to find the resale price that makes the PV of the two options the same.

In other words, the PV of the decision to buy should be:

$32,000 – PV of resale price = $14,672.91 PV of resale price = $17,327.09

The resale price that would make the PV of the lease versus buy decision is the FV of this value, so:

Breakeven resale price = $17,327.09[1 + (.07/12)]¹²⁽³⁾ = $21,363.01

59. To find the quarterly salary for the player, we first need to find the PV of the current contract. The cash flows for the contract are annual, and we are given a daily interest rate. We need to find the EAR so the interest compounding is the same as the timing of the cash flows. The EAR is:

EAR = [1 + (.055/365)]³⁶⁵ – 1 = 5.65%

The PV of the current contract offer is the sum of the PV of the cash flows. So, the PV is:

PV = $7,000,000 + $4,500,000/1.0565 + $5,000,000/1.0565² + $6,000,000/1.0565³ + $6,800,000/1.0565⁴ + $7,900,000/1.0565⁵ + $8,800,000/1.0565⁶

PV = $38,610,482.57

The player wants the contract increased in value by $1,400,000, so the PV of the new contract will be:

PV = $38,610,482.57 + 1,400,000 = $40,010,482.57

The player has also requested a signing bonus payable today in the amount of $9 million. We can simply subtract this amount from the PV of the new contract. The remaining amount will be the PV of the future quarterly paychecks.

$40,010,482.57 – 9,000,000 = $31,010,482.57

To find the quarterly payments, first realize that the interest rate we need is the effective quarterly rate. Using the daily interest rate, we can find the quarterly interest rate using the EAR equation, with the number of days being 91.25, the number of days in a quarter (365 / 4). The effective quarterly rate is:

Effective quarterly rate = [1 + (.055/365)]^91.25 – 1 = .01384 or 1.384%

Now we have the interest rate, the length of the annuity, and the PV. Using the PVA equation and solving for the payment, we get:

PVA = $31,010,482.57 = C{[1 – (1/1.01384)²⁴] / .01384}

C = $1,527,463.76

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60. To find the APR and EAR, we need to use the actual cash flows of the loan. In other words, the interest rate quoted in the problem is only relevant to determine the total interest under the terms given. The cash flows of the loan are the $25,000 you must repay in one year, and the $21,250 you borrow today. The interest rate of the loan is:

$25,000 = $21,250(1 + r)

r = ($25,000 / 21,250) – 1 = .1765 or 17.65%

Because of the discount, you only get the use of $21,250, and the interest you pay on that amount is 17.65%, not 15%.

61. Here we have cash flows that would have occurred in the past and cash flows that would occur in the future.

We need to bring both cash flows to today. Before we calculate the value of the cash flows today, we must adjust the interest rate so we have the effective monthly interest rate. Finding the APR with monthly compounding and dividing by 12 will give us the effective monthly rate. The APR with monthly compounding is:

APR = 12[(1.08)^1/12 – 1] = .0772 or 7.72%

To find the value today of the back pay from two years ago, we will find the FV of the annuity, and then find the FV of the lump sum. Doing so gives us:

FVA = ($47,000/12) [{[ 1 + (.0772/12)]¹² – 1} / (.0772/12)] = $48,699.39 FV = $48,699.39(1.08) = $52,595.34

Notice we found the FV of the annuity with the effective monthly rate, and then found the FV of the lump sum with the EAR. Alternatively, we could have found the FV of the lump sum with the effective monthly rate as long as we used 12 periods. The answer would be the same either way.

Now, we need to find the value today of last year’s back pay:

FVA = ($50,000/12) [{[ 1 + (.0772/12)]¹² – 1} / (.0772/12)] = $51,807.86 Next, we find the value today of the five year’s future salary:

PVA = ($55,000/12){[{1 – {1 / [1 + (.0772/12)]¹²⁽⁵⁾}] / (.0772/12)}= $227,539.14

The value today of the jury award is the sum of salaries, plus the compensation for pain and suffering, and court costs. The award should be for the amount of:

Award = $52,595.34 + 51,807.86 + 227,539.14 + 100,000 + 20,000 = $451,942.34

As the plaintiff, you would prefer a lower interest rate. In this problem, we are calculating both the PV and FV of annuities. A lower interest rate will decrease the FVA, but increase the PVA. So, by a lower interest rate, we are lowering the value of the back pay. But, we are also increasing the PV of the future salary. Since the future salary is larger and has a longer time, this is the more important cash flow to the plaintiff.

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62. Again, to find the interest rate of a loan, we need to look at the cash flows of the loan. Since this loan is in the form of a lump sum, the amount you will repay is the FV of the principal amount, which will be:

Loan repayment amount = $10,000(1.08) = $10,800

The amount you will receive today is the principal amount of the loan times one minus the points.

Amount received = $10,000(1 – .03) = $9,700

Now, we simply find the interest rate for this PV and FV.

$10,800 = $9,700(1 + r)

r = ($10,800 / $9,700) – 1 = .1134 or 11.34%

63. This is the same question as before, with different values. So:

Loan repayment amount = $10,000(1.11) = $11,100 Amount received = $10,000(1 – .02) = $9,800

$11,100 = $9,800(1 + r)

r = ($11,100 / $9,800) – 1 = .1327 or 13.27%

The effective rate is not affected by the loan amount since it drops out when solving for r.

64. First we will find the APR and EAR for the loan with the refundable fee. Remember, we need to use the actual cash flows of the loan to find the interest rate. With the $2,300 application fee, you will need to borrow

$242,300 to have $240,000 after deducting the fee. Solving for the payment under these circumstances, we get:

PVA = $242,300 = C {[1 – 1/(1.005667)³⁶⁰]/.005667} where .005667 = .068/12 C = $1,579.61

We can now use this amount in the PVA equation with the original amount we wished to borrow, $240,000.

Solving for r, we find:

PVA = $240,000 = $1,579.61[{1 – [1 / (1 + r)]³⁶⁰}/ r]

Solving for r with a spreadsheet, on a financial calculator, or by trial and error, gives:

r = 0.5745% per month APR = 12(0.5745%) = 6.89%

EAR = (1 + .005745)¹² – 1 = 7.12%

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With the nonrefundable fee, the APR of the loan is simply the quoted APR since the fee is not considered part of the loan. So:

APR = 6.80%

EAR = [1 + (.068/12)]¹² – 1 = 7.02%

65. Be careful of interest rate quotations. The actual interest rate of a loan is determined by the cash flows. Here, we are told that the PV of the loan is $1,000, and the payments are $41.15 per month for three years, so the interest rate on the loan is:

PVA = $1,000 = $41.15[{1 – [1 / (1 + r)]³⁶ } / r ]

Solving for r with a spreadsheet, on a financial calculator, or by trial and error, gives:

r = 2.30% per month APR = 12(2.30%) = 27.61%

EAR = (1 + .0230)¹² – 1 = 31.39%

It’s called add-on interest because the interest amount of the loan is added to the principal amount of the loan before the loan payments are calculated.

66. Here we are solving a two-step time value of money problem. Each question asks for a different possible cash flow to fund the same retirement plan. Each savings possibility has the same FV, that is, the PV of the retirement spending when your friend is ready to retire. The amount needed when your friend is ready to retire is:

PVA = $105,000{[1 – (1/1.07)²⁰] / .07} = $1,112,371.50 This amount is the same for all three parts of this question.

a. If your friend makes equal annual deposits into the account, this is an annuity with the FVA equal to the amount needed in retirement. The required savings each year will be:

FVA = $1,112,371.50 = C[(1.07³⁰ – 1) / .07]

C = $11,776.01

b. Here we need to find a lump sum savings amount. Using the FV for a lump sum equation, we get:

FV = $1,112,371.50 = PV(1.07)³⁰ PV = $146,129.04