Williams Products Inc. manufactures and sells a number of items, including school knapsacks. The company has been experiencing losses on the knapsacks for some time, as shown by the contribution format income statement below: WILLIAMS PRODUCTS INC.Income StatementSchool KnapsacksFor the Quarter Ended June $30$Sales $$280,000$ Variable expenses: Variable manufacturing expenses$$78,400$ Sales commissions $30,800$ Shipping $8,400$ Total variable expenses $117,600$ Contribution margin $162,400$ Fixed expenses: Salary of product$-$line manager $10,750$ General factory overhead $55,750*$ Depreciation of equipment $($no resale value$)21,000$ Advertisingtraceable $53,250$ Insurance on inventories $4,600$ Purchasing department $32,680$ Total fixed expenses $178,030$ Operating loss $$(15,630)*$Allocated on the basis of machine$-$hours.Allocated on the basis of sales dollars.Discontinuing the knapsacks would not affect sales of other product lines and would have no noticeable effect on the companys total general factory overhead or total purchasing department expenses.Required:a$.$ Compute the increase or decrease of net operating income if the Williams Products Inc line is continued or discontinued. $($Input all amounts as positive except Decreases in Sales, Decreases in Contribution Margin, and Net Losses which should be indicated by a minus sign.$)$Keep School KnapsackDrop School KnapsackDifference: Operating Income Increase or $($Decrease$)$SalesVariable expenses:Variable manufacturing expensesSales commissionsShippingTotal variable expenses$00$Contribution margin$00$Fixed expenses:Salary of product$-$line managerGeneral factory overheadDepreciation of equipmentAdvertisingtraceableInsurance on inventoriesPurchasing departmentTotal fixed expenses$000$Operating loss$$0$$$0$$N