Sky High Seats Manufactures Seats for Airplanes

Sky High Seats manufactures seats for airplanes.The company has the capacity to produce 100,000 seats per year,but is currently produces and sells 75,000 seats per year.The following information relates to current production of seats:

If a special sales order is accepted for 3,000 seats at a price of $300 per unit,and fixed costs increase by $10,000,how would operating income be affected? (NOTE: Assume regular sales are not affected by the special order. )

A) Decrease by $80,000
B) Increase by $230,000
C) Increase by $90,000
D) Increase by $80,000