[The following information applies to the questions displayed below.) Data for Hermann Corporation are shown below: Per Unit $ 80 Selling price Variable expenses Contribution margin Percent of Sales 1008 55 45% $ 36 Fixed expenses are $76,000 per month and the company is selling 2,500 units per month. 2-a. Refer to the original data. How much will net operating income increase (decrease) per month if the company uses components that increase the variable expense by $4 per unit and increase unit sales by 20%. 2-b. Should the higher-quality components be used