A local vendor at the county fair sells snow cones for $.50 each. When 250 snow cones are sold, each snow cone is estimated to have $.10 in variable costs and $.15 in fixed costs. A local school group plans on attending the fair next week and wishes to purchase 50 snow cones for $.25 each. The vendor can sell as many as 400 snow cones per day. If the special order were accepted, net income would:

a. increase by $12.50.

b. increase by $7.50.

c. not change.

d. decrease by $25.00.