Exercise 5-4 Computing and Using the CM Ratio [LO5-3] Last month when Holiday Creations, Inc., sold 40,000 units, total sales were $283,000, total variable expenses were $217,910, and fixed expenses were $36,700. 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 $1,500? (Do not round intermediate calculations.) 1. Contribution margin ratio 2. Estimated change in net operating income