Exercise 6-1 The Effect of Changes in Activity on Net Operating Income (L06-1] Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,200 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 237,600 136,800 100,800 55,900 $ 44,900 Per Unit $ 33.00 19.00 $ 14.00 Required: (Consider each case independently): 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 6,200 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income