Data for Hermann Corporation are shown below Per Unit Percent of Sales Selling price Variable expenses Contribution margin 90 63 27 100% 70 30 % Fixed expenses are $30,000 per month and the company is selling 2,000 units per month Required: 1a. How -b. Should the advertising budget be increased? much will net operating income Increase (decrease) per month if the monthly advertising budget increases by $5,00 and monthly sales increase by $9,000