罗斯《公司理财》英文习题答案chap006

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Chapter 6: Some Alternative Investment Rules 6.1 a. Payback period of Project A = 1 + ($7,500 - $4,000) / $3,500 = 2 years Payback period of Project B = 2 + ($5,000 - $2,500 -$1,200) / $3,000 = 2.43 years Project A should be chosen. b. NPVA = -$7,500 + $4,000 / 1.15 + $3,500 / 1.152 + $1,500 / 1.153 = -$388.96 NPVB = -$5,000 + $2,500 / 1.15 + $1,200 / 1.152 + $3,000 / 1.153 = $53.83 Project B should be chosen. 6.2 a. Payback period = 6 + {$1,000,000 - ($150,000 ( 6)} / $150,000 = 6.67 years Yes, the project should be adopted. b. $150,000 = $974,259 The discounted payback period = 11 + ($1,000,000 - $974,259) / ($150,000 / 1.112) = 11.54 years c. NPV = -$1,000,000 + $150,000 / 0.10 = $500,000 6.3 a. Average Investment: ($16,000 + $12,000 + $8,000 + $4,000 + 0) / 5 = $8,000 Average accounting return: $4,500 / $8,000 = 0.5625 = 56.25% b. 1. AAR does not consider the timing of the cash flows, hence it does not consider the time value of money. 2. AAR uses an arbitrary firm standard as the decision rule. 3. AAR uses accounting data rather than net cash flows. 6.4 Average Investment = ($2,000,000 + 0) / 2 = $1,000,000 Average net income = [$100,000 {(1 + g)5 - 1} / g] / 5 = {$100,000A (1.075 - 1} / 0.07} / 5 = $115,014.78 AAR = $115,014.78 / $1,000,000 = 11.50% No, since the machine’s AAR is less than the firm’s cutoff AAR. 6.5 a PI = $40,000 / $160,000 = 1.04 Since the PI exceeds one accept the project. 6.7 The IRR is the discount rate at which the NPV = 0. -$3,000 + $2,500 / (1 + IRRA) + $1,000 / (1 + IRRA)2 = 0 By trial and error, IRRA = 12.87% Since project B’s cash flows are two times of those of project A, the IRRB = IRRA = 12.87% 6.8 a. Solve x by trial and error: -$4,000 + $2,000 / (1 + x) + $1,500 / (1 + x)2 + $1,000 / (1 + x)3 = 0 x = 6.93% b. No, since the IRR (6.93%) is less than the discount rate of 8%. 6.9 Find the IRRs of project A analytically. Since the IRR is the discount rate that makes the NPV equal to zero, the following equation must hold. -$200 + $200 / (1 + r) + $800 / (1 + r)2 - $800 / (1 + r)3 = 0 $200 [-1 + 1 / (1 + r)] - {$800 / (1 + r)2}[-1 + 1 / (1 + r)] = 0 [-1 + 1 / (1 + r)] [$200 - $800 / (1 + r)2] = 0 For this equation to hold, either [-1 + 1 / (1 + r)] = 0 or [$200 - $800 / (1 + r)2] = 0. Solve each of these factors for the r that would cause the factor to equal zero. The resulting rates are the two IRRs for project A. They are either r = 0% or r = 100%. Note: By inspection you should have known that one of the IRRs of project A is zero. Notice that the sum of the un-discounted cash flows for project A is zero. Thus, not discounting the cash flows would yield a zero NPV. The discount rate which is tantamount to not discounting is zero. Here are some of the interactions used to find the IRR by trial and error. Sophisticated calculators can compute this rate without all of the tedium involved in the trial-and-error method. NPV = -$150 + $50 / 1.3 + $100 / 1.32 + $150 / 1.33 = $15.91 NPV = -$150 + $50 / 1.4 + $100 / 1.42 + $150 / 1.43 = -$8.60 NPV = -$150 + $50 / 1.37 + $100 / 1.372 + $150 / 1.373 = -$1.89 NPV = -$150 + $50 / 1.36 + $100 / 1.36 2 + $150 / 1.363 = $0.46 NPV = -$150 + $50 / 1.36194 + $100 / 1.361942 + $150 / 1.361943 = $0.0010 NPV = -$150 + $50 / 1.36195 + $100 / 1.361952 + $150 / 1.361953 = -$0.0013 NPV = -$150 + $50 / 1.361944 + $100 / 1.3619442 + $150 / 1.3619443 = $0.0000906 Thus, the IRR is approximately 36.1944%. 6.10 a. Solve r in the equation: $5,000 - $2,500 / (1 + r) - $2,000 / (1 + r)2 - $1,000 / (1 + r)3 - $1,000 / (1 + r)4 = 0 By trial and error, IRR = r = 13.99% b. Since this problem is the case of financing, accept the project if the IRR is less than the required rate of return. IRR = 13.99% > 10% Reject the offer. c. IRR = 13.99% < 20% Accept the offer. d. When r = 10%: NPV = $5,000 - $2,500 / 1.1 - $2,000 / 1.12 - $1,000 / 1.13 - $1,000 / 1.14 = -$359.95 When r = 20%: NPV = $5,000 - $2,500 / 1.2 - $2,000 / 1.22 - $1,000 / 1.23 - $1,000 / 1.24 = $466.82 Yes, they are consistent with the choices of the IRR rule since the signs of the cash flows change only once. 6.11 a. Project A: NPV = -$5,000 + $3,500 / (1 + r) + $3,500 / (1 + r)2 = 0 IRR = r = 25.69%