Explanations are greatly appreciated

Whirly Corporation's contribution format income statement for the most recent month is shown below: Per Unit $ 30.00 18.00 Sales (8,700 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 261,000 156,600 104,400 54,200 $ 50,200 $12.00 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 7,700 units? Answer is complete but not entirely correct. 1. $ 8,770 2. Revised net operating income Revised net operating income Revised net operating income $ 8,630 3. $ 7,700 X