Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Fixed expenses are $86,000 per month and the company is selling 2,800 units per month. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,100, the monthly sales volume increases by 100 units, and the total monthly sales increase by $13,000 ? Note: Do not round intermediate calculations