Required information [The following information applies to the questions displayed below) Data for Hermann Corporation are shown below. Selling price Variable expenses Contribution margin Per Unit $ 60 39 $ 21 Percent of Sales 100% 65 35% Fixed expenses are $72,000 per month and the company is selling 4,200 units per month Required: 1-a. How much will net operating Income Increase (decreasej per month If the monthly advertising budget Increases by $9,600, the monthly sales volume Increases by 100 units, and the total monthly sales increase by $6,000? 1-5. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below. Reg 1 Red 10 How much will net operating income increase (decrease) per month if the monthly advertising budget increases by 59.600, the monthly sales volume increases by 100 units, and the total monthly sales increase by $6.000? (Do not reund intermediate calculations, Net operating income by Reg 18>