what is change in operating income ?

Shelhorse Corporation produces and sells a single product. Data concerning that product appear below! Selling price Variable expension Contribution margin Per Unit $ 270 108 $ 162 Percent of Sales 1001 400 601 Fixed expenses are $367.000 per month. The company is currently selling 6.200 units per month Required: The marketing manager believes that a $24,000 Increase in the monthly advertising budget would result in a 160 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? Change in nat operating income