Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,900 units) Variable expenses Contribution margin Fixed expenses Total $ 302,600 160,200 142,400 55,600 Per Unit $ 34.00 18.00 $ 16.00 Net operating income Required: (Consider each case independently): $ 86,800 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 7,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income