Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,400 units) Variable expenses Contribution margin Total $ 222,000 133,200 Fixed expenses 88,800 55,300 Net operating income $ 33,500 Per Unit $ 30.00 18.00 $ 12.00 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 50 units? 2. What would be the revised net operating income per month if the sales volume decreases by 50 units? 3. What would be the revised net operating income per month if the sales volume is 6,400 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income