a pizza business has the cost structure described below. the firm’s fixed costs are $20 per day. Output (pizzas per day) Total cost of output (fixed + variable)
0 $20
5 $80
10 $120
15 $150
20 $175
25 $195
30 $210
35 $230
40 $255. What are the firm's average fixed costs at an output of five pizzas?