Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Per Unit Sales (7,900 units) Variable expenses Contribution margin Fixed expenses $ 244,900 158,000 86,900 54,600 $ 31.00 20.00 $ 11.00 Net operating income $ 32,300 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 6,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income