The Bedrock water department has a monthly service charge of $6.80 and a volume charge of $1.80 for every 100 cubic feet of water. Which of the following equations can be used to determine the
Sandstone family's monthly water bill?
(Let x represent 100 cubic feet of water and y represent the monthly cost.)
A. y = 8.6x
B. y=0.018x + 6.80
c. y = 1.8x - 6.80
D. y = 1.8x + 6.80