A producer of Quidditch brooms employs 400 units of labor at each, and the rental rate of capital is . The marginal product of different units of labor used to produce Quidditch brooms are shown in this table.
\begin{tabular}{ll}
\hline Quantity of Capital & Marginal product of capital \\
\hline 10 & 8200 \\
20 & 8000 \\
30 & 7800 \\
40 & 7600 \\
50 & 7400
\end{tabular}
How much capital should the firm employ to maximize profit?
Choose 1 answer:
(A) 30
(B) 10
(C) 50
(D) 20
(ㄷ) 40
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