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