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