Exercise 6-5 (Algo) Changes in Variable Costs, Fixed Costs, Selling Price, and Volume [LO6-4] Skip to question [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Per Unit Percent of Sales Selling price $ 135 100% Variable expenses 81 60 Contribution margin $ 54 40% Fixed expenses are $87,000 per month and the company is selling 2,900 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 $9,200, the monthly sales volume increases by 100 units, and the total monthly sales increase by $13,500? 1-b. Should the advertising budget be increased?