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A driver wishes to buy gasoline and have her car washed. She finds that the wash costs \$3.00 when she buys 19 gallons at \$1.00 each, but that if she buys 20 gallons, the car wash is free. Thus the marginal cost of the twentieth gallon of gas is:

A) -\$2.00.

B) \$0.00.

C) \$1.00.

D) \$2.00.

E) none of the above.

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