18. TOTAL COST AND MARGINAL Cost Complete the following table, assuming that each unit of labor costs $75 per day. Output Quantity of Labor per Day Fixed Cost $300 Variable Cost per Day Total Cost $ 0 $ Marginal Cost $ 15 12.5 1 75 2 150 450 3 5 11 15 18 20 525 4 300 600 25 5 37.5 a. Graph the fixed cost, variable cost, and total cost curves for these data. b. What is the marginal product of the third unit of labor? c. What is average total cost when output is 18 units per day? 19 Tom 11 wing