Exercise 6-5 (Algo) Changes in Variable Costs, Fixed Costs, Selling Price, and Volume [LO6-4] [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Selling price Variable expenses Contribution margin Percent Per Unit of Sales $ 100 61 100% 61 $ 39 39% Fixed expenses are $80,000 per month and the company is selling 3,700 units per month. Exercise 6-5 (Algo) Part 1 Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,500, the monthly sales volume increases by 100 units, and the total monthly sales increase by $10,000? 1-b. Should the advertising budget be increased