What is the marginal revenue from producing the fourth unit? What is the marginal cost of producing the third unit? How many units should the profit maximizing firm produce? What is the average cost per unit if the firm produces 5 units? What is the fixed cost of producing the 5th unit? # Units Produced 0 1 2 3 4 5 Total Revenue 0 600 780 840 890 910 Total Costs 200 660 720 780 870 980