Exercise 5-4 Computing and Using the CM Ratio [LO5-3] Last month when Holiday Creations, Inc., sold 41,000 units, total sales were $318,000, total variable expenses were $225,780, and fixed expenses were $40,000. 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 $1,300? (Do not round intermediate calculations.) Contribution margin ratio Estimated change in net operating income