The following chart represents the schedule of workers and wages for an ice cream shop. Considering that this is a perfect competitive business, what is the optimum number of workers the company should hire if each worker earns $25 per day and each ice cream cone costs $4?

#workers # ice cream cones MPL
0 0
1 10 10
2 18 8
3 24 6
4 28 4
5 30 2

a. 1 worker
b. 5 workers
c. 2 workers
d. 4 workers
e. 3 workers