The graph presents the costs and revenue for a purely competitive firm, where the market price is equal to $600 per unit of output. This firm has a fixed cost equal to $3,600. Use this information to determine the profit?maximizing output and profit for thisfirm.

Cost and revenue $2,400 2,200 Marginal cost 2,000 1,800 Average total cost 1,600 1,400 1,200 1,000 Average 800 variable cost 600 Marginal revenue 400 200 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Units of output