请帮忙解答下，不是翻译~回答随便用英文或是中文，谢谢
You are asked to advise a monopolist who is producing 5,000 units with total revenues of $25,000. The marginal cost equals ATC, total fixed costs are $10,000, average variable cost is $4 and marginal revenue is $2.50. Is the firm making a profit or loss? What if anything should it this monopolist do with output and price to maximize profits?
