O'Neill, Incorporated's segmented income statement for the most recent month is given below.

	Total Company	Store A	Store B
Sales	$300,000	$100,000	$200,000
Variable expenses	192,000	72,000	120,000
Contribution margin	108,000	28,000	80,000
Traceable fixed expenses	76,000	21,000	55,000
Segment margin	32,000	$7,000	$25,000
Common fixed expenses	27,000
Net operating income	$5,000

For each of the following questions, refer back to the above original data. If Store B sales increase by $20,000 with no change in fixed expenses, the overall company net operating income should:

increase by $2,500

increase by $5,000

increase by $8,000

increase by $12,000