Last month when Harrison Creations, Inc., sold 40,000 units, total sales were $300,000, total variable expenses were $240,000, and fixed expenses were $45,000. Required: 1. What is the companys contribution margin (CM) ratio? (Omit the "%" sign in your response.) Contribution margin ratio % 2. Estimate the change in the companys net operating income if it were to increase its total sales by $1,500. (Omit the "$" sign in your response.) Estimated change in net operating income $