$75 $60 $55 $40 $35 $20 ATC MC AVC 20 30 40 50 65 75 The graph above shows cost curves of a competitive firm in the short run. Refer to the graph to answer the following questions. Suppose the market price is $75: 1. The profit-maximizing output quantity for this firm is 2. The average total cost at the profit-maximizing quantity is $ 3. The profit of this firm if it produces at the profit-maximizing quantity would be $ 4. In other words, the firm is Suppose instead the market price is $55: 1. The profit-maximizing output quantity for this firm is 2. The average total cost at the profit-maximizing quantity is $