问题
单项选择题
At an output quantity equal to 250, a monopoly firm faces a demand curve with a price (P) of $50, a marginal cost (MC) and marginal revenue (MR) equal to $10, and an average total cost (ATC) equal to $12. The economic profit for this monopoly firm is closest to:（）
A. $12500.
B. $10000.
C. $9500.
答案
参考答案：C
解析：
Economic profit = Total revenue - total cost, where total revenue = PQ and total cost = ATC × Q. So, Economic profit = $ 9500 = $ 50 × 250 - $12 × 250.