inve A. onal & Radi a. ater company charges homeowners based on how much water se in thousands of gallons. The company progressively charges at gher rate the more water that is used. Based on the graph at the right how much does the city charged; when a home owner uses the following number of gallons of water: 1700 gallons of water costs 2000 gallons of water costs_ Cost of Water Bill (dollars) 7000 gallons of water costs. The Almet Gravity !