Larita Corporation produces and sells a single product. Data concerning that product appear below:

	Per Unit		Percent of Sales
Selling price	$	280	100%
Variable expenses		126	45%
Contribution margin	$	154	55%

Fixed expenses are $354,000 per month. The company is currently selling 4,900 units per month.

The marketing manager believes that a $23,000 increase in the monthly advertising budget would result in a 170 unit increase in monthly sales.

Required:

What should be the overall effect on the company's monthly net operating income of this change? (Negative amount should be indicated by a minus sign.)

Change in net operating income = .......................