Total Marginal Marginal Marginal Quantity Price Revenue Revenue Total Cost Cost Total Profit Profit 0 140 O -- 5 -- -5 -- 1 120 120 120 45 40 75 80 2 110 220 100 105 60 115 40 3 100 300 80 185 80 115 0 4 90 360 60 285 100 75 4O 5 80 400 40 405 120 5 80 6 70 420 20 545 140 125 120 7 60 420 O 705 160 285 -160 8 50 400 -20 885 180 -485 200 What quantity should the firm produce to maximize profit? What is the marginal revenue at the optimal quantity? What is the marginal cost at the optimal quantity? What is the maximum profit? (>