B1) Fill in the following table for a steel producer who has market power, and then answer the following three questions. total margi avera margi outpu fixed varia nal ge total nal t cost ble total cost reven reven (kg) ($ ) cost ($/ k cost ue ue ($ ) g) ($/k ($ ) ($/k g ) g ) 1 20 15 80 2 30 140 3 40 180 4 60 200 5 90 200 6 120 180 (i) does this table represent the short-run or the long-run? (ii) what is the optimal output for the firm? (iii) what is the firm's profit or loss at this level of output