Exercise 6-1 The Effect of Changes in Activity on Net Operating Income (LO6-1) Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,100 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 220, 100 142,000 78,100 55,200 $ 22,900 Per Unit $31.00 20.00 $ 11.00 s Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 30 units? 2. What would be the revised net operating income per month if the sales volume decreases by 30 units? 3. What would be the revised net operating income per month if the sales volume is 6,100 units? 1. Revised net operating income 2. Revised net operating income 3 Revised net operating income