A cost analysis is to be made to determine what, if anything should be done in a situation offering three "do-something" and one "do-nothing" alternatives. Estimates of the cost and benefits are as follows.

Use a 10-year analysis period for the four mutually exclusive alternatives. At the end of 5 years, Alternatives 1 and 2 may be replaced with identical alternatives (with the same cost, benefits, salvage value, and useful life).

(a) If an 8% interest rate is used, which alternative should be selected?

(b) If a 12% interest rate is used, which alternative should be selected?

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Uniform Useful End-of- Annual Useful-Life Life Alternatives Cost Benefit Salvage Value (years) $S00 600 $135 250 180 100 5 3 4 700 100 10