Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,300 units) Variable expenses Contribution margin Fixed expenses Total $ 219,000 146,000 73,000 Per Unit $ 30.00 20.00 $ 10.00 54,200 Net operating income Required: (Consider each case independently): $ 18,800 1. What would be the revised net operating income per month if the sales volume increases by 90 units? 2. What would be the revised net operating income per month if the sales volume decreases by 90 units? 3. What would be the revised net operating income per month if the sales volume is 6,300 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income