Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Per Unit Sales (8,800 units) $ 299,200 $ 34.00 Variable expenses 158,400 18.00 Contribution margin 140,800 $ 16.00 Fixed expenses 54,400 Net operating income 5 86,400 [ Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 60 units? 2. What would be the revised net operating income per month if the sales volume decreases by 60 units? 3. What would be the revised net operating income per month if the sales volume is 7,800 units? Revised net operating income _ a Revised net operating income _ a Revised net operating income _