Aircraft Products, a manufacturer of aircraft landing gear, makes 2,300 units each year of a special valve used in assembling one of its products. The unit cost of producing this valve includes variable costs of $67 and fixed costs of $65. The valves could be purchased from an outside supplier at $74 each. If the valve were purchased from the outside supplier, 40% of the total fixed costs incurred in producing this valve could be eliminated. Buying the valves from the outside supplier instead of making them would cause the company's operating income to:

Increase by $73,600.

Increase by $43,700.

Decrease by $43,700.

Decrease by $73,600.