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

	Total	Store A	Store B
Sales	$157,500	$61,000	$96,500
Variable expenses	53,760	28,670	25,090
Contribution margin	103,740	32,330	71,410
Traceable fixed expenses	69,100	19,900	49,200
Segment margin	34,640	$12,430	$22,210
Common fixed expenses	20,400
Net operating income	$ 14,240

If Store B sales increase by $43,000 with no change in fixed expenses, the overall company net operating income should:

increase by $4,300

increase by $27,090

increase by $31,820

increase by $8,600

Please Explain