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

	Per Unit	Percent of Sales
Selling price	$140	100%
Variable expenses	70	50%
Contribution margin	$ 70	50%

The company is currently selling 5,700 units per month. Fixed expenses are $342,500 per month. The marketing manager believes that a $6,700 increase in the monthly advertising budget would result in a 120 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change?

Increase of $1,700

Increase of $8,400

Decrease of $6,700

Decrease of $1,700