Data for Hermann Corporation are shown below Selling price Variable expenses Contribution margin Percent Per Unit of Sales 5 85 1001 51 60 $ 34 405 Fixed expenses are $77,000 per month and the company is selling 2,600 units per month Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget Increases by $8,200, the monthly sales volume increases by 100 units, and the total monthly sales increase by $8,500? 1-6. Should the advertising budget be increased