Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,900 units) Variable expenses Contribution margin Pixed expenses Net operating income 267,000 30.00 178,00020.00 89,000 54,800 $ 34,200 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 wo uld 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 7,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income