Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,800 units) Total $ 234,000 Per Unit $ 30.00 Variable expenses Contribution margin 148,200 85,800 19.00 $ 11.00 55,900 Fixed expenses Net operating income Required: (Consider each case independently): $ 29,900 1. What would be the revised net operating income per month if the sales volume increases by 70 units? 2. What would be the revised net operating income per month if the sales volume decreases by 70 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