Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7,500 units) Total Per Unit Variable expenses $ 240,000 150,000 Contribution margin Fixed expenses 90,000 55,500 $ 32.00 20.00 $ 12.00 Net operating income $ 34,500 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 70 units? 2. What would be the revised net operating income per month if the sales volume decreases by 70 units? 3. What would be the revised net operating income per month if the sales volume is 6,500 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income Last month when Holiday Creations, Incorporated, sold 36,000 units, total sales were $144,000, total variable expenses were $120,960, and fixed expenses were $36,300. Required: 1. What is the company's contribution margin (CM) ratio? 2. What is the estimated change in the company's net operating income if it can increase sales volume by 575 units and total sales by $2,300? (Do not round intermediate calculations.) 1. Contribution margin ratio 2. Estimated change in net operating income