Ace Inc. makes seats for buses. The company has the capacity to produce 100,000 seats per year, but currently produces and sells 75,000 seats per year. The following information is about the current production of seats: Sale price per unit Variable costs per unit: Manufacturing $430 $240 Marketing and administrative $70 Total fixed costs: Manufacturing Marketing and administrative $800,000 $220,000 If a special sales order is accepted for 3.200 seats at a price of $350 per unit. and fixed costs increase by $13.000. how would operating income be affected? (NOTE: Assume regular sales are not affected by the special order.) A. Increase by $115,000 B. Increase by $128,000 C. Increase by $339,000 D. Decrease by $115,000