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10. Dybala Corporation's produces and sells a single product. Data concerning that product appear below. Percent of Per Unit Sales Selling price $160 100% Variable expenses 80 50% Contribution margin $ 80 50% The company is currently selling 7,100 units per month. Fixed expenses are $511,800 per month. The marketing manager believes that a $7,500 Increase in the monthly advertising budget would result in a 210 unit Increase in monthly sales. What should be the overall effect on the company's monthly net operating Income of this change? Increase of $16,800 Decrease of $9,300 Decrease of $7,500 Increase of $9,300