EXERCISE 6-1 Preparing a Contribution Format Income Statement [LO1] Whirly Corporation's most recent income statement is shown below: Per Unit Sales (10,000 units). Variable expenses Contribution margin Fixed expenses. Net operating income Total $350,000 $35.00 200,000 20.00 150,000 $15.00 135,000 $ 15,000 Required: Prepare a new contribution format income statement under each of the following conditions (con- sider each case independently): 1. The sales volume increases by 100 units. 2 The sales volume decreases by 100 units. 3. The sales volume is 9,000 units.