Whirly Corporation's contribution format income statement for the most recent month is shown below: 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 8,000 units? Exercise 6-4 (Algo) Computing and Using the CM Ratio [LO6-3] Last month when Holiday Creations, Incorporated, sold 40,000 units, total sales were $160,000, toral variable expenses were $115,200, and fixed expenses were $39,600 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 400 units and total sales by $1,600? (Do not round intermediote calculations.)