Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,000 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 238,000 133,000 105,000 55,600 $ 49,400 Per Unit $ 34.00 19.00 $ 15.00 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 40 units? 2. What would be the revised net operating income per month if the sales volume decreases by 40 units? 3. What would be the revised net operating income per month if the sales volume is 6,000 units