4. Mark and Jeff operate a small company that produces souvenir footballs. Their fixed cost is $2,000 per month. They can hire workers for $1,000 per worker per month. Their monthly production function for footballs is as given in the accompanying table.(18 points)

Quantity Quantity of labor of AVC of AFC of ATC of TC of MC of (workers) footballs football football football football football O 0 N/A N/A N/A N/A 300 2 800 3 1,200 4 1,400 5 1,500