Brace Corporation sells and produces one single product, a maple baseball bat. Data regarding the maple bats appear below: Selling price Variable expenses Per Unit $280 42 Percent of Sales 100% 15% Contribution margin $238 85% Brace's fixed expenses are $200,000 per month. They are currently selling 1,900 baseball bats per month. Brace's management is considering a new super-premium type of maple wood that would increase the unit variable cost by $58 per bat. Since the new maple wood would dramatically improve the company's product, the marketing manager predicts that monthly sales would increase by 600 units. Required: What should be the overall change in Brace Corporation's company's monthly net operating income if the new maple wood is used and fixed expenses are unchanged? (Negative amount should be indicated by a minus sign. Omit the "$" sign in your response.) Change in net operating income