Slughorn Company produces and sells a single product. Data concerning that product appear below:

	Per Unit		Percent of Sales
Selling price	$	270	100%
Variable expenses		108	40%
Contribution margin	$	162	60%

Fixed expenses are $367,000 per month. The company is currently selling 6,200 units per month.

The marketing manager believes that a $24,000 increase in the monthly advertising budget would result in a 160 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.)