An engineer has been offered an investment op­portunity that will require a cash outlay of $40,000 now for a cash inflow of $3500 for each year of investment. However, she must state now the number of years she plans to retain the invest­ment. Additionally, if the investment is retained for 6 years, a lump-sum amount of $36,000 will be returned to her; after 10 years, the lump-sum return is anticipated to be $49,000, and after 15 years, it is estimated to be $55,000. Money is currently worth 10% per year. (a) Is the decision sensitive to the retention period? If so, what in­vestment period is best? (b) Write the format of the spreadsheet function that will display the correct PW values.

What will be an ideal response?


PW6 = -40,000 + 3500(P/A,10%,6) + 36,000(P/F,10%,6)
= -40,000 + 3500(4.3553) + 36,000(0.5645)
= $-4,434

PW10 = -40,000 + 3500(P/A,10%,10) + 49,000(P/F,10%,10)
= -40,000 + 3500(6.1446) + 49,000(0.3855)
= $396

PW15 = -40,000 + 3500(P/A,10%,15) + 55,000(P/F,10%,15)
= -40,000 + 3500(7.6061) + 55,000(0.2394)
= $-212

The PW is sensitive to the investment period; invest for 10 years

Function format: = - PV(10%,investment_years,3500,lump_sum) – 40000 displays PW

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