Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,000 units) Contribution margin Variable expenses Total $ 264,000 152,000 Per Unit $ 33.00 19.00 112,000 $ 14.00 Fixed expenses 55,700 Net operating income $ 56,300 Required: (Consider each case independently): 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 7,000 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income