6-152 The label on a washing machine indicates that the washer will use $85 worth of hot water if the water is heated by a 90 percent efficient electric heater at an electricity rate of $0.09/kWh. If the water is heated from 15 to 55°C, the amount of hot water an average family uses per year is a) 10.5 tons b) 20.3 tons c) 18.3 tons d) 22.6 tons e) 24.8 tons | |
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