Water is pumped to a height with a total head of 39.36 meters. The available power is 60 cycles, 220 volts, three-phase. Find the horsepower of an electric motor to drive a centrifugal pump at 3450 rpm having a discharge pipe of 2 inches. Assume a water flow velocity of 5 ft/sec and 70% pump efficiency. Find the monthly billing if the pump is running 30 days at 20 hours per day in operation. The cost of electrical energy is Php 2.60 per kW-h. Assume motor efficiency of 85%.