Whirly Corporation's contribution format income statement for the most recent month is shown below: Variable expenses Sales (7,300 units) Contribution margin Fixed expenses Total $ 219,000 146,000 73,000 55, 900 Per Unit $ 30.00 20.00 $ 10.00 Net operating income $ 17,100 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 would 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 6,300 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income