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: Total Per Unit Sales (8,000 units) Variable expenses Contribution margin $ 280,000 152,000 128,000 $ 35.00 19.00 $ 16.00 Fixed expenses Net operating income $ 55,400 72,600 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 50 units? 2. What would be the revised net operating income per month if the sales volume decreases by 50 units? 3. What would be the revised net operating income per month if the sales volume is 7,000 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income