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 (8,400 units) $277,200 $33.00 Variable expenses 168,000 20.00 Contribution margin 109,200 $%13.00 Fixed expenses Net operating income 53, 500 55,700 Required: Consider each case independently) 1. What would be the revised net operating income per month if the sales volume increases by 100 units? 2. What would be the revised net operating income per month if the sales volume decreases by 100 units? 3. What would be the revised net operating income per month if the sales volume is 7,400 units? 1. Revised net operating income 2 Revised net operating income 3 Revised net operating income