Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Per Unit Sales (7,400 units) $ 229 , 400 $ 31.00 Variable expenses 148,000 20.00 Contribution margin 81, 400 $ 11.00 Fixed expenses 55, 100 Net operating income $ 26,300 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 30 units? 2. What would be the revised net operating income per month if the sales volume decreases by 30 units? 3. What would be the revised net operating income per month if the sales volume is 6,400 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income