Variable Input Fixed Input Output Marginal Physical Product of Variable Input Total Fixed Cost Total Variable Cost Marginal Cost (units) (units) (units) (units) (dollars) (dollars) (dollars) 0 1 0 $500 $0 1 1 10 (A) $500 $200 (F) 2 1 25 (B) $500 $400 (G) 3 1 45 (C) $500 $600 (H) 4 1 60 (D) $500 $800 (I) 5 1 70 (E) $500 $1000 (J) Refer to Exhibit 21-3. What is the average total cost of producing 60 units of output