Compute the overall increase or decrease in the net operating income of Northern Stores if store I is closed. Northern stores is a retailer in the upper Midwest. The most recent monthly income statement for Northern stores is given below: Northern is considering closing Store I. If Store I is closed, one-fourth of its traceable fixed expenses would continue. Also, the closing of Store I 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 it store were shut down