Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,600 units) Variable expenses Contribution, margin Fixed expenses Net operating income Required: Total Per Unit $ 266,600 154,800 111,800 $ 31.00 18.00 $ 13.00 56,000 $ 55,800 (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.7,600 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income