Question: A 2 . 4 - m high 2 0 0 - m ^ 2 house is maintained at 2 1 C by an air

"A 2.4-m high 200-m^2 house is maintained at 21 C by an air-conditioning system whose COP is 3.2. It is estimated that the kitchen, bath, and other ventilating fans of the house discharge a houseful of conditioned air once every hour. If the average outdoor temperature is 34 C, the density of air is 1.20 kg/m^3, and the unit cost of electricity is $0.10/kWh, the amount of money (in dollar without $ sign, using Cp=1.005 kJ/kg.K) vented out by the fans in 10 hours is ?"

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