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Bohlen Corporation produces and sells a single product. Data concerning that product appear below: Per Unit Percent of Sales 100% Selling price.... Variable expenses. Contribution margin.. $180 36 $144 20% 80% Fixed expenses are $716,000 per month. The company is currently selling 6,000 units per month Consider each of the following questions independently This question is to be considered independently of all other questions relating to Bohlen Corporation Refer to the original data when answering this question. The marketing manager believes that a $20,000 increase in the monthly advertising budget would result in a 180 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? decrease of $5,920 increase of $25,920 increase of $5,920 decrease of $20,000