Contribution Margin by Segment The following information is for Elm Leaf Apparel: Sales volume (units): Product Alpha Product Omega Sales price: East West 4,700 4,800 5,200 9,000 Product Alpha $17 $19 Product Omega $21 $22 Variable cost per unit: Product Alpha Product Omega $10 $10 $13 $13 a. Determine the contribution margin for the East Region and West Region. East Region: $ West Region: $ b. Determine the contribution margin ratio for the East Region and West Region. Round the contribution margin ratio to one-tenth of a percent. East Region: West Region: % %