Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,500 units) Variable expenses Contribution margin Per Unit Total $ 255,000 142,500 112,500 56,000 $ 34.00 19.00 $ 15.00 Net operating income. $ 56,500 Fixed expenses Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 60 units? 2. What would be the revised net operating income per month if the sales volume decreases by 60 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