Larita Corporation produces and sells a single product Data concern the produd below Selling price Variable expenses $230 100% 2014 Contribution margin $184 8096 Fixed expenses are $363,000 per month. The company is currently selling 5,800 units per month The marketing manager believes that a $20,000 increase in the monthly advertising budget would result in a 120 unit increase in monthly sales. Required: What should be the overall effect on the company's monthly net operating income of this change? (Negative amount should be indicated by a minus sign.) Change in net operating income