Whirly Corporations contribution format income statement for the most recent month is shown below:

1. What would be the revised net operating income per month if the sales volume increases by 40 units?

2. What would be the revised net operating income per month if the sales volume decreases by 40 units?

3. What would be the revised net operating income per month if the sales volume is 7,900 units?

Required: (Consider each case independently)