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 $480,000 Sales Variable expenses Variable manufacturing expenses Sales commissions Shipping $137,000 41,000 19,000 Total variable expenses 197,000 283,000 Contribution margin Fixed expenses Advertising Depreciation of equipment (no resale 21,000 110,000 value) General factory overhead Salary of product-line manager Insurance on inventories Purchasing department 43,000* 128,000 12,000 52,000t Total fixed expenses 366,000 Net operating loss $ (83,000) 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.)