Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,500 units) Variable expenses Contribution margin Fixed expenses Total Per Unit $ 232,500 142,500 90,000 55,000 $ 35,000 $ 31.00 19.00 $ 12.00 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 90 units? 2. What would be the revised net operating income per month if the sales volume decreases by 90 units? 3. What would be the revised net operating income per month if the sales volume is 6,500 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income