Exercise 5-4 Computing and Using the CM Ratio (LO5-3] Last month when Holiday Creations, Inc., sold 41,000 units, total sales were $315,000, total variable expenses were $229,950, and fixed expenses were $37,700. 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 $1,800? (Do not round intermediate calculations.) % 1. Contribution margin ratio 2. Estimated change in net operating income