Pong Incorporated's segmented income statement for the most recent month is given below.

	Total	Store A	Store B
Sales	$158,300	$63,100	$95,200
Variable expenses	53,767	30,919	22,848
Contribution margin	104,533	32,181	72,352
Traceable fixed expenses	68,400	17,000	51,400
Segment margin	36,133	$15,181	$20,952
Common fixed expenses	22,100
Net operating income	$ 14,033

The marketing department believes that a promotional campaign for Store A costing $8,700 will increase sales by $18,200. If its plan is adopted, overall company net operating income should:

decrease by $582

decrease by $4,805

increase by $582

increase by $9,500

select the correct answer.