Consider a firm that produces fans. The table below gives the total cost of producing a given number of fans per day. Suppose that the market price for fans is 12$. How many fans should the firm produce per day?
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| Fans produced per day | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Total Cost | 0 | 1 | 3 | 8 | 15 | 24 | 35 | 47 | 70 | 84 | 100 |