Saved 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 O a. EAW = $ 21,745 O b. EAW = $2,285 O c. EAW = $318 O d. EAW = $7,739