Last period Hartig Corporation sold 45,000 units, total sales were $284,000, total variable expenses were $215,840, and fixed expenses were $39,900. 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 $2,700? (Do not round intermediate calculations.) 1. Contribution margin ratio 2. Estimated change in net operating income %