The only variable input a janitorial service firm uses to clean offices is workers who are paid a wage, \(w\), of \(\$ 8\) 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 7.1 to show the variable cost, average variable cost, and marginal cost curves.

Figure 7.1:-

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Cost per unit, $ 28 27 20 8 (a) Cost, $ 400 216 120 40 48 60 0 2 B 0 2 4 6 8 F C VC 10 Quantity, q, Units per day 10 MC AC AVC AFC Quantity, q, Units per day