Dybala Corporation's produces and sells a single product. Data concerning that product appear below: Per Unit Percent of Sales Selling price $140 100% Variable expenses 70 50% Contribution margin $ 70 50% The company is currently selling 4,900 units per month. Fixed expenses are $285,700 per month. The marketing manager believes that a $7,100 increase in the monthly advertising budget would result in a 200 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 $14,000

B Decrease of $7,100

C Increase of $6,900

D Decrease of $6,900