18. The cost of electricity at the local utility company is 10 cents per kilowatt-hour for the first 100 kilowatt-hours used in a month and 7 cents per kilowatt-hour for each additional kilowatt-hour used. What is the cost for 500 kilowatt-hours used in 1 month?

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

From the meaning of the question, we can know: the first 100kwh of 500kwh costs 10cents, and then of the remaining 400kwh, every 100kwh costs 7cents, and the total calculation is 10+7*4=38.