Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Fixed expenses are $73,000 per month and the company is selling 4,300 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,700, the monthly sales volume increases by 100 units, and the total monthly sales increas by $6,500 ? 1-b. Should the advertising budget be increased