Total Marginal Marginal Marginal Quantity Price Revenue Revenue Total Cost Cost Total Profit Profit 0 260 0 --- 5 --- -5 --- 1 200 200 200 25 20 175 180 2 170 340 140 45 20 295 120 3 140 420 80 65 20 355 60 4 110 440 20 85 20 355 0 5 80 400 40 105 20 295 60 6 50 300 100 125 20 175 120 7 20 140 -160 145 20 -5 180 8 -10 -80 -220 165 20 -245 240 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? () ()