Data concerning Runnells Corporation's single and sells a product. Data co cerning that product appear below: The company is currently selling 5,800 units per month. Fixed expenses are $407,600 per month. The marketing manager believes that a $6,800 increase in the monthly advertising budget would result in a 110 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? Multiple Choice Increase of $2,000 Decrease of $6,800 Increase of $8,800 Decrease of $2,000