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,eee units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 217,eee 133,eee 84, eee 54,500 $ 29,500 Per Unit $31.00 19.ee $12.00 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 6.000 units