se the following information to answer the question. Quantity of Output Fixed Costs Variable Costs Total Costs Marginal Costs 0 $20 $0 ______ ______ 1 20 10 ______ ______ 2 20 22 ______ ______ 3 20 36 ______ ______ 4 20 52 ______ ______ 5 20 72 ______ The average fixed cost of producing four units is _______. a. $52 b. $20 c. $10 d. $5 e. none of the answer choices