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EXERCISE 5-5 Changes in Variable Costs, Fixed Costs, Selling Price, and Volume L05-44 Data for Hermann Corporation are shown below: Per Unit Percent of Sales Selling price $90 100% Variable expenses 63 70 Contribution margin $27 30% Fixed expenses are $30,000 per month and the company is selling 2,000 units per month. Page 228 Required: 1. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $5,000 and monthly sales increase by $9,000? 2. 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 $2 per unit and increase unit sales by 10%