# Production Costs

If the total cost of producing 10 units is $100 and the marginal cost of the eleventh unit is $21, then which of the following is NECESSARILY true?

A) Total variable costs of 11 units are $121.

B) Total fixed costs are $79.

C) The marginal cost of the tenth unit is more than $21.

D) The average total cost of 11 units is $11.

E) The average total cost of 12 units is $12

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(D)is correct.

Because the total cost of producing 10 units ...

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$2.19