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Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,620 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 228,000 136,800 91,200 55,000 $ 36,200 Per Unit $ 30.00 18.00 $ 12.00 Required: (Consider each case independently 1. What would be the revised net operating income per month of 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 6.600 units? ces 1 Revised net operating income 2. Revised net operating income 3. Revised net operating income