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

	Per Unit	Percent of Sales
Selling price	$160	100%
Variable expenses	80	50%
Contribution margin	$ 80	50%

The company is currently selling 6,500 units per month. Fixed expenses are $464,500 per month. The marketing manager believes that a $6,500 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?

Increase of $5,500

Increase of $12,000

Decrease of $5,500

Decrease of $6,500