not sure if its - or + 4615

A power converters is under consideration for a specific application. An economic comparison is to be made using an interest of 12%, and the following costs estimates have been obtained. Determine the annual equivalent costs of the alternative system. Purchase price: $20,000 Estimated service life: 9 years Salvage value: $5,000 Annual operating cost: $1,200 ga. EAW = -1,200 O b. EAW = -4,615 Oc. EAW = 4,615 O d. EAW = -2,215