Data concerning Runnells Corporation's single and sells a product. Data co cerning that product appear below: Per Unit $140 70 Percent of Sales 100% 50% Selling price Variable expenses 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? O Decrease of $1,700 O Increase of $1,700 O Increase of $8,400 O Decrease of $6,700