Use the following information to answer questions 56-58.

The table below shows an electric utility company's old and new rates. In the table, kWh stands for kilowatt-hour, a standard unit for measuring electrical energy.

56. LaTasha is a computer programmer for the electric company. She updated the program for calculating customers' monthly bills. Which of the following is an expression that uses the new rates to calculate the bill, in dollars, of a customer who uses x kWh of electricity during the month, where x > 1,500?

Answer and Explanation

Your Answer is

Correct Answer is K

Explanation

First of all, according to the meaning of the question, the monthly fixed fee in the new policy is $11. Secondly, the part that does not exceed 1500 kilowatts will be calculated at 6.7￠=$0.067 per kilowatt, that is, $0.067×1500. Third, the part that exceeds 1500 kilowatts will be calculated at per kilowatt 6.2￠=$0.062 calculation, that is, $0.062×(x-1500), the total fee is $11 + 0.067×1500 + 0.062×(x-1500), so choose K