Thalassines Kataskeves, S.A., of Greece makes marine equipment. The company has been experiencing losses on its bilge pump product line for several years. The most recent quarterly contribution format income statement for the bilge pump product line follows Thalassines Kataskeves, S.A. Income Statement-Bilge Pump For the Quarter Ended March 31 $850,000 Sales Variable expenses Variable manufacturing expenses Sales commissions Shipping $330,000 42,000 18,000 Total variable expenses 390,000 460,000 Contribution margin Fixed expenses 270,000 80,000 105,000* 32,000 8,000 45,000t sing Depreciation of equipment (no resale value) General factory overhead Salary of product-line manager Insurance on inventories Purchasing department Total fixed expenses 540,000 Net operating loss $ (80,000) Common costs allocated on the basis of machine-hours tCommon costs allocated on the basis of sales dollars Discontinuing the bilge pump product line would not affect sales of other product lines and would have no effect on the company's total general factory overhead or total Purchasing Department expenses Required a. Compute the increase or decrease of net operating income if the product line is continued or discontinued. (Decreases should be indicated by a minus sign.)