Could you please help me with this question?

The following table shows cost data for a perfectly competitive firm. Average Fixed Average Variable Average Total Marginal Output Cost Cost Cost Cost 1 $500 $120 $620 $120 2 250 108 358 95 3 167 97 263 75 125 88 213 60 109 81 181 55 83 78 161 60 71 78 149 80 63 81 144 105 56 87 143 135 10 50 96 146 170 If the product price is $55. the profit-maximizing output is