12 ook n Priest rences Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Percent of Per Unit Sales Selling price $110 100% Variable expenses 77 70 Contribution margin $ 33 30% Fixed expenses are $82,000 per month and the company is selling 3,500 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,700 and monthly sales increase by $19.800? 1-b. Should the advertising budget be increased