The table shown below gives the short-run total cost function Noel’s window cleaning firm. This firm competes in a perfectly competitive market.

Number Of Jobs Completed Total Costs in $
0 30
1 37
2 48
3 65
4 92
5 129
6 169

Noel’s firm charges the market price for window washing jobs, $30/job. At what output will the firm maximize profit? What will that profit be?