Water is pumped from one storage tank to a higher tank at a steady rate of 1L/s. The difference in the elevations of the two water tanks is 50m. The storage tank, which serves a source, is open to the atmosphere, while the tank receiving the water has a pressure of 170.3kPa. The length of the suction piping is 10m and the length of the discharge piping is 75m. The power supplied by an electric motor to the pump shaft is 1000W. All piping is 1 -in, schedule-40 steel pipe. Find the pump efficiency