Last month when Holiday Creations, Incorporated, sold 38,000 units, total sales were $152,000, total variable expenses wer $118,560, and fixed expenses were $37,800. 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 450 units and total $1,800? (Do not round intermediate calculations.) 1. Contribution margin ratio 2. Estimated change in net operating income