Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,600 units) Variable expenses Contribution margin. Total $ 283,800 163,400 Per Unit $ 33.00 19.00 $14.00 120,400 Fixed expenses 54,300 Net operating income. $ 66,100 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 70 units? 2. What would be the revised net operating income per month if the sales volume decreases by 70 units? 3. What would be the revised net operating income per month if the sales volume is 7,600 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income