Multiple Choice
A driver wishes to buy gasoline and have his car washed.He finds that the wash costs $2.50 when he buys 19 gallons at $1.10 each, but that if he buys 20 gallons, the car wash is free.Thus the marginal cost of the twentieth gallon to him is:
A) $1.40.
B) $1.10.
C) -$1.40.
D) -$1.10.
E) $2.50.
Correct Answer:

Verified
Correct Answer:
Verified
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