Kuzio Corporation produces and sells a single product. Data concerning that product appear below: 
Per Unit Percent of Sales 
Selling price....................... $130 100% 
Variable expenses.............. 78 60% 
Contribution margin.......... $ 52 40% 
The company is currently selling 6,000 units per month. Fixed expenses are $263,000 per month. The marketing manager believes that a $5,000 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? 
A) increase of $2,280 
B) increase of $7,280 
C) decrease of $5,000 
D) decrease of $2,280