Northern Stores is a retailer in British Columbia. The most recent monthly income statement for Northern Stores is given below: Total Store Store II $2,700,000 1.500.000 $1,200,000 420.000 $1,400,000 $1,000,000 $400,000 280.000 $1,300,000 500.000 $800,000 140,000 Sales Less variable expense Contribution margin Less traceable fixed expense Segment margin Less common fixed expense Operating Income $780,000 270.000 $120,000 103.000 S660,000 1670001 S510,000 $17.000 $493,000 Northern is considering closing Store 1 If Store 1 is closed, one-fourth of its traceable fixed expenses would continue to be incurred. Also, the closing of Store I would result in a 25% decrease in sales in Store II. Northern allocates common fixed expenses on the basis of sales dollars and none of these costs would be saved if a store were shut down. Required: Compute the overall increase or decrease in the operating income of Northern Stores if Store I is closed