The following table shows cost data for a perfectly competitive firm.

Output	Average Fixed Cost	Average Variable Cost	Average Total Cost	Marginal Cost
1	$500	$120	$620	$120
2	250	108	358	95
3	167	97	263	75
4	125	88	213	60
5	100	81	181	55
6	83	78	161	60
7	71	78	149	80
8	63	81	144	105
9	56	87	143	135
10	50	96	146	170

If the product price is $55, the profit-maximizing output is

Multiple Choice

• 0.
• 76.
• 112.
• 152.