! Required Information [The following Information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Percent Per Unit of sales Selling price $ 105 108% Variable expenses 63 60 Contribution margin $ 42 40% Fixed expenses are $81,000 per month and the company is selling 3,800 units per month. Required: 1-a. How much will net operating Income Increase (decrease) per month if the monthly advertising budget Increases by $8,600, the monthly sales volume Increases by 100 units, and the total monthly sales Increase by $10,500? 1-b. Should the advertising budget be Increased