Difficulty: Easy
Average Score: 94%

The graph shows the relative costs of three sources of drinkable water from 1970 to 2020 (projected): piping in freshwater from farther than 75 miles away, piping in freshwater from less than 75 miles away, and treating brackish (non-drinkable) groundwater. Based on the information contained in this graph alone, which one of the following statements can be determined or reasonably inferred?

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