Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Percent Selling price Per Unit of Sales $ 90 Variable expenses 63 100% 70 Contribution margin $ 27 30% Fixed expenses are $30,000 per month and the company is selling 2,000 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $5,000 and monthly sales increase by $9,000? 1-b. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below. Req 1A Req 1B How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $5,000 and monthly sales increase by $9,000? Net operating income decreases by $ 2,300