Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,900 units) Total $293,700 Per Unit Variable expenses 178,000 Contribution margin 115,700 $ 33.00 20.00 $ 13.00 Fixed expenses Net operating income 55,600 $ 60,100 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 7,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income