Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,000 units) Contribution margin Variable expenses Fixed expenses Net operating income Required: Total Per Unit $ 280,000 144,000 136,000 $ 35.00 18.00 $ 17.00 55,700 $ 80,300 (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 7,000 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income