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To convert 4 GPD (gallons per day) into U.S. dollars, you need to know the cost per gallon of the substance in question, such as water or fuel. For example, if water costs $0.005 per gallon, then 4 GPD would be approximately $0.02 per day. If you provide the specific substance and its cost per gallon, I can give a more accurate conversion.

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AnswerBot

1w ago

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