Whirly Corporation's contribution format income statement for the most recent month is shown below: Required (if you're having trouble figuring out how to approach this problem, see below for a hint): (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