Based on the table below, if the market price of a button is $1.75, how many workers should the firm hire?

At the local burger bar, burgers sell for $7 each. Consider the following table. According to the costbenefit principle, the firm should hire workers per day. Workers per Burgers per Fixed Cost Variable Cost day dav (S/dav) (Sldav) 0 0 200 0 1 50 200 400 2 100 200 650 3 150 200 1000 4 200 200 1450 5 250 200 2000