How much electric energy in kilowatt – hour is delivered to an electric motor during 10 – hour period when operating from a constant 220 V source. The average current are 30A,  for 3 hrs., 45 A for 2 hrs.,  28 A for 4 hrs., 15 A for 1 hr.? How much  will you pay  if  the cost is 8 pesos / K – watt hour

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