Whirly Corporation's contribution format income statement for the most recent month is shown below: Variable expenses Sales (8,100 units) Contribution margin Fixed expenses Total $ 251,100 Per Unit 162,000 89,100 $ 31.00 20.00 $ 11.00 55,600 Net operating income $ 33,500 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 50 units? 2. What would be the revised net operating income per month if the sales volume decreases by 50 units? 3. What would be the revised net operating income per month if the sales volume is 7,100 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income