Exercise 5-4 (Algo) Computing and Using the CM Ratio [LO5-3] Last month when Holiday Creations, Incorporated, sold 39,000 units, total sales were $156,000, total variable expenses were $118,560, and fixed expenses were $35,700. 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 sales volume by 600 units and total sales by $2,400? (Do not round intermediate calculations.) 1 Contribution margin ratio 2 Estimated change in net operating income