Exercise 6-4 Computing and Using the CM Ratio (L06-3] Last month when Holiday Creations, Inc., sold 35,000 units, total sales were $313,000, total variable expenses were $253,530, and fixed expenses were $36,000. 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 total sales by $2,500? (Do not round Intermediate calculations.) 1919 1. Contribution margin ratio 2. Estimated change in net operating income