Exercise 5-1 The Effect of Changes in Activity on Net Operating Income (LO5-1) 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 $ 252,000 129,600 122,400 56,000 $ 66,400 Per Unit $ 35.00 18.00 $ 17.00 Required: (Consider each case independently): 1. What would be the revised net operating income per me if the sales volum reases 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 6,200 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income