A producer of Quidditch brooms employs \[400\] units of labor at \[\$10\] each, and the rental rate of capital is \[\$200\]. The marginal product of different units of labor used to produce Quidditch brooms are shown in this table. Quantity of Capital Marginal product of capital \[10\] \[8200\] \[20\] \[8000\] \[30\] \[7800\] \[40\] \[7600\] \[50\] \[7400\] How much capital should the firm employ to maximize profit? Choose 1 answer: Choose 1 answer: (Choice A) \[20\] A \[20\] (Choice B) 10 B 10 (Choice C) \[30\] C \[30\] (Choice D) \[40\] D \[40\] (Choice E) \[50\] E \[50\]