Data for Herron Corporation are shown below Per Unit $ 125 80 Percent of Sales 100% 64% Selling price Variable expenses Contribution margin $ 45 36% Fixed expenses are $85,000 per month and the company is selling 2,700 units per month. References Section Break Exercise 3-5 Changes in Variable Costs, Fixed Costs, Selling Price, and Volume [LO3-4] value: 12.50 points Exercise 3-5 Part 1 Required 1-a. The marketing manager believes that an $9,000 increase in the monthly advertising budget would increase monthly sales by $20,000. Calculate the increase or decrease in net operating income Net operating income by