Answer: C. an output level of about four.
Explanation: In order to maximize profit, the firm should produce where its marginal revenue and marginal cost are equal. The firm's marginal cost of production is $20 for each unit. When the firm produces 4 units, its marginal revenue is $20. Thus, the firm should produce 4 units of output.
To find it, divide the total cost (TC) by the quantity the firm is producing (Q). Average cost (AC) or average total cost (ATC): the per-unit cost of output.
Output producer prices are the basic prices received by the producer exclusive of taxes on products, separately invoiced transport charges, and retail and wholesale margins.