Required information The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Selling price Variable expenses Contribution margin Per Unit $ 125 80 $ 45 Percent of Sales 100% 64 36% Fixed expenses are $85,000 per month and the company is selling 2,700 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,000 and monthly sales increase by $20,000? 1-b. Should the advertising budget be increased