Question

A gallon of gasoline contains about 36 kilowatt hours of energy. a gallon of gas cost $2.50. a kilowatt hour of electricity costs 8 cents. which form of energy is less expensive?

Answer 1

Use conversion method to convert gallons of gasoline into cents per kilowatt hour in order to compare the two forms of energy.
$\frac{1 gal}{36 kwhr} x \frac{2.50}{1 gal} = \frac{2.50}{36 kwhr} = 0.07$

The cost of gas is $0.07 per killowatt hour
The cost of electricity is $0.08 per killowatt hour

Answer: Gasoline is less expensive