Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,300 units) Contribution margin Variable expenses Total $ 273,900 166,000 107,900 Per Unit $ 33.00 20.00 $ 13.00 Fixed expenses 54,700 Net operating income $ 53,200 Required: es (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 7,300 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income