Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Sales (8,400 units) Variable expenses Contribution margin $ 260,400 168,000 92,400 54,200 Per Unit $ 31.00 20.00 $ 11.00 Fixed expenses Net operating income Required: (Consider each case independently): $ 38,200 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 7,400 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income