Whirly Corporation's contribution format income statement for the most recent month is shown below: Total $ 257,400 156,000 101,400 54,600 $ 46,800 Per Unit $ 33.00 20.00 $ 13.00 Sales (7,800 units) Variable expenses Contribution margin Fixed expenses Net operating income 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 6,800 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income