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Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,500 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 280,500 153,000 127,500 54,200 $ 73,300 Per Unit $ 33.00 18.00 $ 15.00 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 40 units? 2. What would be the revised net operating income per month if the sales volume decreases by 40 units? 3. What would be the revised net operating income per month if the sales volume is 7,500 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income