Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Sales (7,600 units) Variable expenses $ 235,600 144,400 Contribution margin 91,200 Per Unit $ 31.00 19.00 $ 12.00 Fixed expenses Net operating income 55,900 $ 35,300 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 6,600 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income