please help 1

AirWizz Products, o manufacturer of aircraf landing geor, mokes 3,000 unins each yesr of a speclat valve used in assembling one of its procucts. The unit cost of produeng thas valne includes variable produchg this valve could be efliminated. Buying the valves from the outsde supplier instead of making them would cause the company soperating income to: Musple Choice Decieme by 145000 Detrene by 5 meco. increase by 57 mooo. kerease or 545000