Data concerning Runnells Corporation's single and sells a product. Data co cerning that product appear below:

	Per Unit	Percent of Sales
Selling price	$150	100%
Variable expenses	75	50%
Contribution margin	$ 75	50%

The company is currently selling 4,800 units per month. Fixed expenses are $302,600 per month. The marketing manager believes that a $7,200 increase in the monthly advertising budget would result in a 210 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change?

	Decrease of $7,200
	Increase of $15,750
	Decrease of $8,550
	Increase of $8,550