The U.S. Department of Energy estimates that 570,000 barrels of oil would be saved per day if

Question:

The U.S. Department of Energy estimates that 570,000 barrels of oil would be saved per day if every household in the United States lowered the thermostat setting in winter by 6°F (3.3°C). Assuming the average heating season to be 180 days and the cost of oil to be $40/barrel, determine how much money would be saved per year.