6-7. Three mutually exclusive project alternatives are being evaluated. The estimated cash flows for each alternative are given below. The MARR is 15% per year. At the conclusion of its useful life the investment will be sold. (6.4) Investment Project life Annual revenue $5,200 $6,000 $7,500 Annual cost Salvage value $1,200 $1,500 $2,500 Project A Project B Project C $6,000 $8,000$9,000 10 years 10 years 10 years $2,100 $1,800 $2,000 A decision-maker can select one of these alternatives or deride to select none of them. Make a recommendation rine the AW and PW methods