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QUESTION

Maria wishes to buy gasoline and have her car washed. She finds that if she buys 9 gallons of gasoline at $2.

Maria wishes to buy gasoline and have her car washed. She finds that if she buys 9 gallons of gasoline at $2.50 per gallon, the car wash costs $2, but if she buys 10 gallons of gasoline, the car wash is free. For Maria, the marginal cost of the tenth gallon of gasoline and car wash is? 

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