A special purpose 30-horsepower electric motor has an efficiency of 89%. Its purchase and installation price is $2.100. A second 30-horsepower high-em ciency motor can be purchased for S3.200, and its efficiency is 94%. Either motor will be operated 3,500 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR = 15% 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 $1,100 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 15% per year a. The PW of the motor with the efficiency of 89% is SLI (Round to the nearest dollar.)