Dybala Corporation produces and sells a single product. Data concerning that product appear below: Per r Unit Percent of Sales Selling price Variable expenses Contribution margin $ 120 84 36 100 % 70% 30% The company is currently selling 5,340 units per month. Fixed expenses are $120,000 per month. The ager believes that a $7.400 increase in the monthly advertising budget would result in a 340 monthly sales. What should be the overall effect on the company's monthly net operating unit increase in income of this change? O increase of $4,840 O decrease of $7,400 O increase of $12,240 O decrease of $4,840