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EXERCISE 6-1 The Efrect of Changes in Activity on Net Operating Income LO6-1 Whirly Corporation's contribution format income statement for the most recent month is shown below: Cost-Volume-Profit Relationships 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