The only variable input a janitorial service firm uses to clean offices is workers who are paid a wage, w, of $16 an hour. Each worker can clean four offices in an hour. Use math to determine the variable cost, the average variable cost, and the marginal cost of cleaning one more office. Draw a diagram like Figure 6.1 to show the variable cost, average variable cost, and marginal cost curves.

Figure 6.1

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4 400 VC 216 B 120 48 8 10 Quantity, q, Units per day 60 MC АС 39 AVC 20 8 AFC 6. 8. 10 Quantity, q, Units per day Cost, $ e Cost per unit, $ 3