Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Per Unit $ 33.00 Sales (8,700 units) Variable expenses Contribution margin $ 287,100 156,600 18.00 $ 15.00 130,500 Fixed expenses 54,800 Net operating income $ 75,700 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 7,700 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income