Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,800 units). Total $ 290,400 Per Unit Variable expenses 167,200 $ 33.00 19.00 Contribution margin 123,200 $ 14.00 Fixed expenses 55,100 Net operating income $ 68,100 Required: (Consider each case independently): 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 7,800 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income