TB Problem Qu. 6-223 (Algo) Shelhorse Corporation produces and... Shelhorse Corporation produces and sells a single product. Data concerning that product appear below: Selling price Variable expenses Contribution margin Percent of Per Unit Sales $ 200 100% 80. 40% $ 120 60% Fixed expenses are $350,000 per month. The company is currently selling 4,500 units per month. Required: The marketing manager believes that a $19,000 increase in the monthly advertising budget would result in a 190 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