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

	Total	Per Unit
Sales (7,400 units)	$ 236,800	$ 32.00
Variable expenses	140,600	19.00
Contribution margin	96,200	$ 13.00
Fixed expenses	54,800
Net operating income	$ 41,400

Required:

(Consider each case independently):

1. What would be the revised net operating income per month if the sales volume increases by 90 units?
2. What would be the revised net operating income per month if the sales volume decreases by 90 units?
3. What would be the revised net operating income per month if the sales volume is 6,400 units?