Dybala Corporation's produces and sells a single product. Data concerning that product appear below:

Per UnitPercent of SalesSelling price$160100%Variable expenses80

50%

Contribution margin$ 80

50%

The company is currently selling 5,500 units per month. Fixed expenses are $383,300 per month. The marketing manager believes that a $6,500 increase in the monthly advertising budget would result in a 140 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change?

Decrease of $6,500

Decrease of $4,700

Increase of $11,200

Increase of $4,700