The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Percent of Sales 100% 65% Per Unit $ 60 Selling price Variable expenses 39 Contribution margin $ 21 35% Fixed expenses are $72,000 per month and the company is selling 4,200 units per month. value: .00 points Required 1-a. The marketing manager argues that a $9,600 increase in the monthly advertising budget would increase monthly sales by $23,000. Calculate the increase or decrease in net operating income. Net operating income by