(15 points) Northern Stores is a retailer in the upper Midwest. The most recent monthly income statement for Northern Stores is given below: Sales...... Variable expenses................ Contribution margin........... Traceable fixed expenses ...... Segment margin. Common fixed expenses.. Net operating income. Total $2,100,000 1.260,000 840,000 420,000 420,000 350,000 $ 70.000 Store | $1,300,000 882,000 418,000 231,000 187,000 210.000 $ (23.000) Store Il $800,000 378.000 422.000 189.000 233.000 140.000 $ 93.000 Northern is considering closing Store I. If Store l is closed, one-fourth of its traceable fixed expenses would continue. Also, the closing of Store | would result in a 20% 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 net operating income of Northern Stores if Store I is closed. Show