Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,400 units) Variable expenses Contribution margin Total Per Unit $ 251,600 140,600 111,000 54,500 $ 56,500 $ 34.00 19.00 $ 15.00 Fixed expenses Net operating income Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 30 units? 2. What would be the revised net operating income per month if the sales volume decreases by 30 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