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 (8,800 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 281,600 167,200 114,400 55,400 $ 59,000 Per Unit $ 32.00 19.00 $ 13.00 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 7,800 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income