Water (20C) is pumped through the 300-mm steel pipe from the lower tank to the upper one at a rate of 0.4 m/s. Given that the pump efficiency is 65% and the pump is on for 5 hours each day, what will be the monthly (30 days) energy cost for the pump if the electricity rate is 0.5 USD per kWh? Elevation = 235 m Elevation = 200 m 300 mm y= 300 mm 100 m 10 m + 50 m