Price Marginal cost Average total cost Average variable cost $4.00 - 3.00 d= Marginal revenue - Average revenue 2.50 10 15 Quantity Refer to Exhibit 8.7, which shows the demand and the cost curves of a perfectly competitive firm. At what quantity is the firm's loss minimized? a) 1 10 units b) below 5 units ( c) 15 units O d) between 5-10 units O e) 5 units