1 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: 0:47:12 Sales (8,900 unito) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 284,800 178,000 106,800 54,200 $ 52,600 Por Unit $ 32.00 20.00 $ 12.00 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 70 units? 2. What would be the revised net operating income per month if the sales volume decreases by 70 units? 3. What would be the revised net operating income per month if the sales volume is 7,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income