4. Data concerning Abbott Corporation's single product appear below: Percent of Sales Per Unit S 110 Selling price Variable expenses Contribution margin 100 % 40 % 60 S 66 Fived expenses are $440,000 per month. The company is currently selling 8,000 units per month. Required The marketing manager believes that an $8,000 increase in the monthly advertising budget would result in a 150 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change