Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,400 units) Total $ 285,600 Per Unit $ 34.00 Variable expenses Contribution margin 151,200 134,400 18.00 $ 16.00 Fixed expenses Net operating income Required: (Consider each case independently): 54,300 $ 80,100 1. What would be the revised net operating income per month if the sales volume increases by 60 units? 2. What would be the revised net operating income per month if the sales volume decreases by 60 units? 3. What would be the revised net operating income per month if the sales volume is 7,400 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income