Angela wishes to buy gasoline and have her car washed she


Angela 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 Angela, the marginal cost of the tenth gallon of gasoline and car wash is

a. zero.
b. 50 cents.
c. $2.00.
d. $2.50.

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Macroeconomics: Angela wishes to buy gasoline and have her car washed she
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