Exercise 6-4 Computing and Using the CM Ratio [LO6-3] Last month when Holiday Creations, Inc., sold 36,000 units, total sales were $317,000, total variable expenses were $221,900, and fixed expenses were $39,300. 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 $2,400 ? (Do not round intermediate calculations.)