Dybala Corporation's produces and sells a single product. Data concerning that product appear below Percent of Sales Seling price Variable expenses Contribution margin Per Unit $150 75 % 75 100% 50% 50% The company is currently selling 5,600 units per month. Fixed expenses are $363,400 per month. The marketing manager believes that a $6,600 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? Increase of $9,750 Increase of $3,150 Decrease of $6,600 O Decrease of $3,150