Question: Hot water usage for a house cost per year is $34 that is supplied by an 85 percent efficient electric heater at an electricity rate

Hot water usage for a house cost per year is $34 that is supplied by an 85 percent efficient electric heater at an electricity rate of $0.08/kWh. If the water is heated from 25 to 60°C, the amount of hot water an average family uses per year is

(a) 11.5 tons (b) 15.6 tons (c) 38.7 tons

(d) 20.8 tons (e) 12.3 tons

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