Percent Per Unit of Sales Selling price $ 90 100% Variable expenses 63 70% Contribution margin $ 27 30% Fixed expenses are $78,000 per month and the company is selling 3,500 units per month. value: 10.00 points QC_CS-216765 Required: 1-a. The marketing manager argues that a $8,300 increase in the monthly advertising budget would increase monthly sales by $16,200. Calculate the increase or decrease in net operating income. (Round any unit calculations up to the nearest whole unit.) Net operating income decreases by $ 3,440