1. and cont AIC AVE 11 10 Refer to the above figure. The firm's short-run supply curve is its marginal cost curve. marginal cost curve from b and above. marginal cost curve from c and above. d. marginal cost curve from d and above. 2. Refer to the above figure. Total revenue at the profit-maximizing level of output is EL $1,200. b. $2.500. C $4,800. d. $6,000. 3. Refer to the above figure. The total cost at the profit-maximizing output level equals EL 54,800. b. $3,300. $2.500. d. $1,800. 4. Refer to the above figure. At the profit-maximizing output level, the firm cams zero economic profit. a profit of 5600. c a profit of 51,200. d. a profit of $2,700