pls help?!

Last period Hartig Corporation sold 39,000 units, total sales were $296,000, total variable expenses were $248,640, and fixed expenses were $39,500 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 $2,1007 (Do not round Intermediate calculations.) 1. Contribution margin ratio 2. Estimated change in net operating income