Whirly Corporation's contribution format income statement for the most recent month is shown below: Total Per Unit $233,600 138,700 Sales (7,300 units) Variable expenses $32.00 19.00 $ 13.00 Contribution margin 94,900 Fixed expenses 54,700 40,200 Net operating income Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 40 units? 2. What would be the revised net operating income per month if the sales volume decreases by 40 units? 3. What would be the revised net operating income per month if the sales volume is 6,300 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income