A firm with two plants, A and B, has the following estimated demand and marginal cost functions:Qd = 120 - 10PMCA = 4 + (1 / 5)QAMCB = 6 + (1 / 10)QBWhat is the firm's marginal revenue function?
A. MR = 12 - (1/5)Q
B. MR = 120 - 20Q
C. MR = 12 - (1/5)P
D. MR = 120 - 20P .
E. none of the above
Answer: A
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