Last month, Stan used 15,600 cu ft of natural gas. The therm factor is 1.2. The per therm rates are: first 70 therms $0.30 per therm; over 70 therms $0.25 per therm. The customer service charge is $8.80. Sales tax is 3%.
7.

What is the cost of the gas?
Answers

A.
$59.10

B.
$50.30

C.
$42.50

D.
$41.50