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TB Problem Qu. 5-239 Shelhorse Corporation produces and ... Shehorse Corporation produces and sells a single product Data concerning that product appear below Vercent of Selling price Variable Contribution margin Fixed expenses are $364.000 per month. The company is currently selling 5.900 units per month Required: The marketing manager believes that a $21000 increase in the monthly advertising budget would result in a 130 unit increase in monthly sales. What should be the overall effect on the company's monthly net cperating income of this change Change net operating income