Trescott Company Had the Following Results of Operations for the Past

Trescott Company had the following results of operations for the past year:
A foreign company (whose sales will not affect Trescott's market) offers to buy 3,000 units at $17.00 per unit.In addition to variable manufacturing costs,selling these units would increase fixed overhead by $500 and selling and administrative costs by $1,000.If Trescott accepts the offer,its profits will:

A) Decrease by $4,500.
B) Increase by $4,500.
C) Decrease by $300.
D) Increase by $13,500.
E) Increase by $15,000.