Exercise 5-5 (Algo) Changes in Variable Costs, Fixed Costs, Selling Price, and Volume (LO5-4) [The following information applies to the questions displayed below.) Data for Hermann Corporation are shown below: Selling price Variable expenses Contribution margin Per Unit $ 70 49 $ 21 Percent of Sales 1004 70 304 Fixed expenses are $74,000 per month and the company is selling 4,400 units per month Exercise 5-5 (Algo) Part 1 Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,800, the monthly sales volume increases by 100 units, and the total monthly sales increase by $7,000? 1-b. Should the advertising budget be increased