Whirly Corporation's contribution format income statement for the most recent month is shown below:     Total   Per Unit Sales (10,000 units) $ 350,000   $ 35

Whirly Corporation's contribution format income statement for the most recent month is shown below:

  Total   Per Unit Sales (10,000 units) $ 350,000   $ 35.00   Variable expenses   200,000     20.00   Contribution margin   150,000   $ 15.00   Fixed expenses   135,000         Net operating income $ 15,000          

Required:

(Consider each case independently):

1. What would be the revised net operating income per month if the sales volume increases by 100 units?

2. What would be the revised net operating income per month if the sales volume decreases by 100 units?

3. What would be the revised net operating income per month if the sales volume is 9,000 units?