Exercise 6-4 Computing and using the CM Ratio (LO6-3) Last month when Holiday Creations, Inc., sold 45,000 units, total sales were $285,000, total variable expenses were $228,000, and fixed expenses were $36,900. 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 $2,900? (Do not round intermediate calculations.) % 1. Contribution margin ratio 2. Estimated change in net operating income