A 55-kW motor at full load is used to drive a pump that generates 50 meters of head while pumping water at a
rate of 5,000 liters per minute. Calculate the pump efficiency.
A new lighting system costs $60,000. The new lighting system has a 15-year life and the minimum required
rate of return (MARR) is 15%. How much must the new lighting system save to be life-cycle cost effective?