Whirly Corporation's contribution format income statement for the most recent month is shown below: Total $ 308,000 176,000 Sales (8,800 units) Variable expenses Contribution margin Fixed expenses Net operating income Per Unit $ 35.00 20.00 $ 15.00 132,000 54,300 77,700 $ 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 7,800 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income