Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,400 units) Variable expenses Contribution margin Fixed expenses Net operating income points Total $ 260,400 168,000 92,400 55,709 $ 36,700 Per Unit $31.00 20.00 $ 11.00 eBook Hint Print Required: (Consider each case independently): References 1. What would be the revised net operating income per month if the sales volume increases by 80 units? 2. What would be the revised net operating income per month if the sales volume decreases by 80 units? 3. What would be the revised net operating income per month if the sales volume is 7,400 units? 1 Revised net operating income 2. Revised net operating income 3. Revised net operating income