Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,900 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 267,000 169,100 97,900 55,700 $ 42,200 Per Unit $ 30.00 19.00 $ 11.00 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 7,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income Last month when Holiday Creations, Incorporated, sold 39,000 units, total sales were $156,000, total variable expense were $126,360, and fixed expenses were $38,400. 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 475 units an total sales by $1,900? (Do not round intermediate calculations.) % 1. Contribution margin ratio 2. Estimated change in net operating income