Question: A homeowner is considering these heating systems for heating his house: Electric resistance heating with $0.09/kWh and 1 kWh = 3600 kJ, gas heating with

A homeowner is considering these heating systems for heating his house: Electric resistance heating with $0.09/kWh and 1 kWh = 3600 kJ, gas heating with $1.24/therm and 1 therm = 105,500 kJ, and oil heating with $1.25/gal and 1 gal of oil = 138,500 kJ. Assuming efficiencies of 100 percent for the electric furnace and 87 percent for the gas and oil furnaces, determine the heating system with the lowest energy cost.

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