Machines that have the following costs are under consideration for a new manufacturing process. Compute the Equivalent Annual Worth with an interest rate of 8%, compounded semiannually. The machine last 4 years. First cost: $72,000 Semiannual Operating cost: $6,000 Semiannual incomes: $18,000 Salvage value: $9,000 a. EAW = $318 b. EAW = $7, 739 C. EAW = $ 21, 745 d.EAW = $2, 285