Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Fixed expenses are $85,000 per month and the company is selling 2,700 units per month. Required (see below for a hint if you get stuck): -a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,000 and the nonthly sales volume increases by 100 units? -b. Should the advertising budget be increased