Suppose a firm has a shor

Suppose a firm has a shor

Suppose a firm has a short-run cost equation of C(q) = 0.1q? 3q+ 60q + 1000, and short-run marginal cost equation of MC(q) = .3q? 6q + 60, if the firm produces 25 units of output:c. Use the MC(q) equation to solve for the marginal cost of the last unit produced.What number do I use for ‘q’ for the final unit? Do I use 25 because it is the 25th unit produced? And if so, how is it possible to have a negative MC

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