Last month when Holiday Creations, Inc., sold 42,000 units, total sales were $311,000, total variable expenses were $245,690, and fixed expenses were $36,600 Required . 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 $1,600? (Do not round intermediate calculations.) Answer is complete but not entirely correct. Contribution margin ratio 21 1% Estimated change in net operating income 2. 1,600