Data for Hermann Corporation are shown below: Per unit Percent of Sales Selling price $73.00 100% Variable expenses 36.50 50 Contribution margin $36.50 50% Fixed expenses are $75,100 per month and the company is selling 4,600 units per month. Requirement 1: Calculate the increase or decrease in net operating income if a $7,400 increase in the monthly advertising budget would increase monthly sales by $14,000.(Negative amount should be indicated by a minus sign. Omit the "$" sign in your response.) Net operating income $