Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,100 units) Variable expenses Total $ 243,000 153,900 Per Unit Contribution margin 89,100 $ 30.00 19.00 $ 11.00 Fixed expenses 54,700 Net operating income $ 34,400 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 7,100 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income