A perfectly competitive firm faces a market-determined price of $40 for its product. Fill in columns and answer the question below.

(1) (2) (3) (4) (5) (6) (7) Quantity Total cost Average Marginal Marginal Profit Total total cost cost revenue margin profit 0 $1,500 100 $4,000 200 $6,600 300 $9,600 400 $14,000 500 $19,200