4 Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,900 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 268,600 150, 100 118,500 55,100 $ 63,400 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 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 6,900 units? Answer is complete but not entirely correct. 1. $ 184,300 2 Revised net operating income Revised net operating income Revised net operating income $ 179,500 3. $ 151,900