Last period Hartig Corporation sold 39,000 units, total sales were $302,000, total variable expenses were $250,660, and fixed expenses were $36,800. 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 total sales by $2,200? (Do not round intermediate calculations.) % 1. Contribution margin ratio 2. stimated change in net operating come