Complete Table 21.5: The marginal cost of the third unit of output in Table 21.5 is
A) $4.
B) $3.
C) $30.
D) $15.

Name: Complete Table 21.5: The marginal cost of the third unit of output in Table 21.5 is A) $4. B) $3. C) $30. D) $15.
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Question

Complete Table 21.5:  The marginal cost of the third unit of output in Table 21.5 is
A) $4. 
B) $3. 
C) $30. 
D) $15.

Quizplus · Accepted Answer

The marginal cost of the third unit is the change in total cost divided by the change in quantity, which is ($15 - $12) / (3 - 2) = $3. Therefore, the correct answer is choice B.