305 Shelhorse Corporation produces and sells a single product. Data concerning that product appear below: Percent of Per Unit Sales Selling price $180 1001 Variable expenses 54 Contribution margin $ 126 709 Fixed expenses are $344,000 per month. The company is currently selling 3,900 units per month Required: The marketing manager believes that a $13,000 Increase in the monthly advertising budget would result in a 130 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? Change in not operating income