The Bridgeport water department has a monthly service charge of $12.90 and a usage charge of $1.57 for every 100 cubic feet of water. Which of the following equations can be used to determine the monthly water bill of a Bridgeport resident? (Let x represent the amount of water used in hundreds of cubic feet and y represent the monthly cost.)
A.
y = 1.57x + 12.90
B.
y = 1.57x - 12.90
C.
y = 14.47x
D.
y = 0.0157x + 12.90
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