6-25. Two 100 horsepower motors are being considered for use: ABC Brand XYZ Brand Purchase price $ 1900 6200 Life in years 10 10 Salvage value $ None None Annual maintenance $ 170 310 Efficiency % 80 90 If power costs $0.10 per kWh, and if the interest rate is 12%, how many hours of operation per year is required to justify the purchase of XYZ brand motor? (1 hp = 0.746 kW). Which motor would you select if the motor is expected to operate 2,000 hours per year? Explain why. (6.4)