Doug, Marilyn and Tran are to provide advice on the suppliers for hamburgers for the food court. Isosceles Foods charges a delivery fee of $52.50 and $1.10 for each hamburger. Scalene Wholesale charges a delivery fee of $12.30 and $1.17 for each hamburger.

a. Determine the cost of purchasing 200 hamburgers from each company.

b. Determine the cost of purchasing 2000 hamburgers from each company.

c. If cost is the main concern, describe the circumstances under which each company should be selected.