Whirly Corporation's contribution format income statement for the most recent month is shown below: Total $ 258,400 144,400 114,000 55,700 $ 58,300 Per Unit $ 34.00 19.00 $ 15.00 Sales (7,600 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 40 units? 2. What would be the revised net operating income per month if the sales volume decreases by 40 units? 3. What would be the revised net operating income per month if the sales volume is 6,600 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income