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 Year 5, Alternatives 1 and 2 may be replaced with identical alternatives (with the same cost, benefits, salvage value, and useful life). Use annual cash flow analysis to solve (a) & (b). If a 5% interest rate is used, which alternative should be selected? If a 10% interest rate is used, which alternative should be selected