If the total cost of producing 10 units equals $90, and the average total cost of producing 11 units equals $8.75, then the marginal cost of the eleventh unit produced:
a. is definitely greater than the marginal cost of producing the tenth unit.
b. is definitely less than the marginal cost of producing the tenth unit.
c. is less than the average total cost of producing ten units
d. is greater than the average total cost of producing ten units.
c
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