ces Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,000 units) Total $ 231,000 Per Unit Variable expenses 133,000 Contribution margin 98,000 $ 33.00 19.00 $ 14.00 Fixed expenses 54,400 Net operating income $ 43,600 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 80 units? 2. What would be the revised net operating income per month if the sales volume decreases by 80 units? 3. What would be the revised net operating income per month if the sales volume is 6,000 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income