please answer the following quesiton with three parts

Whirly Corporation's contribution format income statement for the most recent month is shown below: Per Unit $ 32.00 20.00 $ 12.00 Sales (8,500 units) Variable expenses Contribution margin Fixed expenses Net operating income Required: (Consider each case independently): Total $ 272,000 170,000 102,000 55,500 $ 46,500 1. What would be the revised net operating income per month if the sales volume increases by 80 units? 2. What would be the revised net operating income per month if the sales volume decreases by 80 units? 3. What would be the revised net operating income per month if the sales volume is 7,500 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income