Whirly Corporation's contribution format income statement for the most recent month is shown below: Variable expenses Sales (7,600 units) Contribution margin Total $ 228,000 144,400 Fixed expenses 83,600 54,500 Per Unit $ 30.00 19.00 $ 11.00 Net operating income $ 29,100 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 70 units? 2. What would be the revised net operating income per month if the sales volume decreases by 70 units? 3. What would be the revised net operating income per month if the sales volume is 6,600 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income