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1,660/yr. 33)(P/A, 10%, 6) will be justified by the annual fuel savings. 67 If the composite auto costs more than $4,646 compared to the “traditional” auto, the purchase should not be made. ) Reduced fuel expense per year is being traded off against extra investment for the composite auto. 90 5-13 True interest rate in the IRR associated with the equation PW(i') = 0. 5% per six months. 8542 From Table C-2, N ≈ 24 months. 56 5-18 Principal contributed Future worth at 6% per year a b Janet $10,000 $56,571a Bill $25,000 $54,865b $1,000 (F/A,6%,10) (F/P,6%,25) $1,000 (F/A,6%,25) Janet will have accumulated more money in her retirement account than Bill by age 65 even though her contribution of principal was less than half of what Bill invested.

317 years = 49 years (to nearest whole year). 70 for the equipment. 09 Remember that the cash flow is negative but expressed as a positive cost. 303 Thus, (N-2) = 9 and N = 11 years . Note that if the system lasts for only 10 years, the present equivalent of the cash inflows < present equivalent of the cash outflows. 56 The present equivalent of the rental income is greater than the present equivalent of the $8,000 investment, so the rental property appears to be a good investment. 37 > $10,000, ∴ i < 8% Thus, 7% < i < 8%.

19(F/P,8%,64) = $457,937 93 Chapter 4 Solutions Each grandchild could have received an additional $457,937/10 = $45,794 Chapter 4 Solutions 94 Solutions to Spreadsheet Exercises 4-108 EOY 0 1 2 3 4 5 6 7 8 P A F Cash Flow $ (15,000) $ 2,000 $ 2,500 $ 3,000 $ 3,500 $ 4,000 $ 4,000 $ 4,000 $ 4,000 $ 2,189 $ 410 $ 4,692 Notice that a cell is not designated for the interest rate. Therefore, the interest rate must be entered specifically in the NPV, PMT, and FV financial functions. 38 4-109 i / yr Years in series 18% 8 EOY 0 1 2 3 4 5 6 7 8 P0 = $ 1,294 F8 = $ 4,864 A= $ 317 Cash Flow $ $ $ $ $ $ $ $ $ 100 200 500 400 400 400 400 400 In Example 4-12, the project was acceptable at the original MARR = 20%.

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