Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,000 units) Variable expenses Contribution margin Total $ 264,000 144,000 120,000 55,700 Net operating income $ 64,300 Fixed expenses Per Unit $ 33.00 18.00 $ 15.00 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 80 units? 2. What would be the revised net operating income per month if the sales volume decreases by 80 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