Ronnie wants to lower his utility bills to save money on his monthly expenses. He discovers that if he replaces his water heater with a solar water heater his monthly utility bills can decrease around 50% to 85%. At the end of the year Ronnie wants to calculate the percentage his new solar water heater saved him in the utility bills compared to last year. Ronnie? s total utility expenses for this year are $862.40 and last year the utility expenses were $1935.67. What percentage did Ronnie save on his utlility bills by switching to a solar water heater?

a.

44.5%

b.

97.8%

c.

55.4%

d.

67.5%

Question

Mathematics

Louis Koch

24 May, 20:36

Ronnie wants to lower his utility bills to save money on his monthly expenses. He discovers that if he replaces his water heater with a solar water heater his monthly utility bills can decrease around 50% to 85%. At the end of the year Ronnie wants to calculate the percentage his new solar water heater saved him in the utility bills compared to last year. Ronnie? s total utility expenses for this year are $862.40 and last year the utility expenses were $1935.67. What percentage did Ronnie save on his utlility bills by switching to a solar water heater?

a.

44.5%

b.

97.8%

c.

55.4%

d.

67.5%

+3

Answers (1)

Know the Answer?

Seth Frank · Answer 1

In order to calculate the decrease in Ronnie's utility bills, we will first calculate the change in the bills. The difference between the two bills is: 1935.67 - 862.40 = $1073.27 The percentage decrease in Ronnie's bill is: (1073.27 / 1935.67) x 100 = 55.4% Therefore, Ronnie's bill decreased by 55.4% and the answer is C.