A special-purpose 30-horsepower electric motor has an efficiency of 91% Its purchase and installation price is $2 200 A second 30-horsepower high-efficiency motor can be purchased for $3 200 and its efficiency is 92%. Either motor will be operated 3.500 hours per year at full load and electricity costs $0.09 per kilowatt-hour (kWh) MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period a. Which motor should be chosen? b. For an incremental investment of $1,000 in the more efficient motor, what is the PW of the energy savings over the eight-year period? Click the icon to view the interest and annuity table for discrete compounding when i = 12% per year a. The PW of the motor with the efficiency of 91% is $ (Round to the nearest dollar)