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 2 2-a. Refer to the original data. How much will net operating income increase (decrease) per month if the company uses higher-quality components that increase the variable expense by $5 per unit and increase unit sales by 20%. 2-b. Should the higher-quality components be used?