If the monopolist's marginal revenue curve is MR = 30

Name: If the monopolist's marginal revenue curve is MR = 30 - 6Q,the marginal revenue of the third unit of output is A) $6. B) $12. C) $18. D) $30. E) unknown.
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Question

If the monopolist's marginal revenue curve is MR = 30 - 6Q,the marginal revenue of the third unit of output is
A) $6.
B) $12.
C) $18.
D) $30.
E) unknown.

Quizplus · Accepted Answer

The third unit of output means Q=3. 
Substituting Q=3 into MR = 30 - 6Q gives: 
MR = 30 - 6(3) 
MR = 30 - 18 = 12 
Therefore, the marginal revenue of the third unit of output is $12.