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 Variable expenses Contribution margin $ 80 44 100% 55 $ 36 458 Fixed expenses are $76,000 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 $8,100, the monthly sales volume increases by 100 units, and the total monthly sales increase by $8,000? 1-b. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below.