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 $ 115 100% Variable expenses 69 8 Contribution margin $ 46 40% Fixed expenses are $83,000 per month and the company is selling 2,500 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,800, th monthly sales volume increases by 100 units, and the total monthly sales increase by $11,500? 1-b. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below. Required 1A Required 1B How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,800, the monthly sales volume increases by 100 units, and the total monthly sales increase by $11,500? Note: Do not round intermediate calculations