A kilowatt-hour is a unit of measure for consumable energy. A kilowatt-hour, written kWh, is equivalent to using 1,000 watts of power in 1 hour. The table above shows the per-kWh rates charged by several electric companies in New England. According to the United States Energy Information Administration, an average household in New England uses between 530 and 730 kWh of energy per month. Which inequality represents how much less in energy costs a household would pay per month if it uses Company D as its energy supplier, than if it uses Company B?
Electric Company
Company A
Company B
Company C
Company D
Price (cents per kWh)
15.2
17.4
16.5
14.8