The Mackinac Fudge Company has enlarged its retail space at a cost of $20,000 to allow customers to view the fudge production process. In addition, it has started providing free samples of fudge estimated to cost $.25 per customer. The average customer buys a $10.00 box of fudge and the related cost of the fudge is $5.00 per customer. How many boxes of fudge must be sold to cover the new promotional costs, including the cost of more space and the free samples? (round up to the nearest whole box)

a. 3,333 boxes.

b. 3,810 boxes.

c. 4,000 boxes.

d. 4,211 boxes.

e. 5,000 boxes.