Average and marginal cost (AC and MC) $12 0 00 -Average cost (AC) -Marginal cost (MC) $200 00 $180 00 $160 00 $140 00 $120 0D $100 00 $80.00 $60.00 $40.00 $20.00 $0.00 2 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 90 Output quantity (q) The graph shows the AC (blue line) and MC (red line) for a firm. If the price is $40, and the firm chooses to operate, what quantity does firm produce? (Click nearest answer.) 0 5 O 10 O 20 O 40