Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,400 units) Variable expenses Contribution margin Total $ 268,800 151,200 Per Unit $ 32.00 18.00 117,600 $ 14.00 54,400 Net operating income $ 63,200 Fixed expenses Required: (Consider each case independently): 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 7,400 units? Answer is complete but not entirely correct. Revised net operating 1. $ 55,870 income Revised net operating + 2. 53,530 income Revised net operating 3. $ 41,700 income