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 (7,700 units) Variable expenses Contribution margin Per Unit Total $ 261,800 146,300 Fixed expenses 115,500 54,600 $ 34.00 19.00 $ 15.00 Net operating income $ 60,900 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 6,700 units? 1. Revised net operating income 2 Revised net operating income 3. Revised net operating income