Whirly Corporation's contribution format income statement for the most recent month is shown below: Total $ 308,000 167,200 Sales (8,800 units) Variable expenses Contribution margin Fixed expenses Net operating income Per Unit $ 35.00 19.00 $ 16.00 140,800 55,900 $ 84,900 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 90 units? 2. What would be the revised net operating income per month if the sales volume decreases by 90 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