The Bedrock water department has a monthly service charge of $6.80 and a volume charge of $2.21 for every 100 cubic feet of water. Determine how much water the Sandstone family used if their June water bill is $73.10. A. 3,100 cubic feet of water B. 3,300 cubic feet of water C. 2,800 cubic feet of water D. 3,000 cubic feet of water