Shelhorse Corporation produces and sells a single product. Data concerning that product appear below: Selling price Variable expenses Contribution margin Per Unit $ 230 46 $184 Percent of Sales 1000 201 801 Fixed expenses are $363,000 per month. The company is currently selling 5,800 units per month Required: The marketing manager belleves that a $20,000 Increase in the monthly advertising budget would result in a 120 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? Change in net operating income