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Three mutually exclusive design alternatives are being considered. The estimated cash flows for each alternative are given below. The MARR is 20% per year. At the end of the useful life, the investment will be sold. A decision-maker can select one of these alternatives or decide to select none of them. Make a recommendation using the PW method. Investment cost $28,000 Annual expenses $16,000 $55,000 $40,000 $12,000 $21,000 $23,000 $30,000 $30,000 Annual revenues $8,500 $10,000 $6,500 Market value Useful life 10 years 10 years 10 years 19.5% 22.4% 30.8% IRR The Pw of alternative A is (Round to the nearest dollar