2. The table to the right gives the output per hour of a firm which manufactures chairs. Suppose this firm sells its output in a perfectly competitive market and hires its inputs in competitive markets. If the price of chairs is $5, and the wage paid to the firm's workers is $30, how many chairs will the firm produce to maximize profits?

Workers	Chairs/Hour
0	0
1	5
2	12
3	20
4	27
5	33
6	38
7	42
8	45