Turtle Corporation produces and sells a single product. Data concerning that product appear below: Selling price Variable expenses Contribution margin Per Unit $150 60 $ 90 Percent of Sales 100% 408 60% The company is currently selling 7,000 units per month. Fixed expenses are $214,000 per month. The marketing manager believes that a $7.500 increase in the monthly advertising budget would result in a 190 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? Multiple Choice Increase of $9,600 decrease of $7,500 decrease of $9,600