Two electric motors are being considered to drive a centrifugal pump. One of the motors must be selected. Each motor is capable of delivering 60 horsepower (output) to the pumping operation. It is expected that the motors will be in use 800 hours per year. The following data are available: (6.5) Capital investment Motor A Motor B $1,200 $1,000 0.92 0.80 Electrical efficiency Annual maintenance Useful life $160 $100 6 years 3 years