! Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Percent of Sales Per Unit Selling price Variable expenses $140 1008 91 65 Contribution margin $ 49 35% Fixed expenses are $88,000 per month and the company is selling 3,000 units per month Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,300 and monthly sales increase by $21,500? 1-b. Should the advertising budget be increased