Contribution Margin by Segment The following information is for Moss Creek Apparel: Sales volume (units): Product Alpha Product Omega Sales price: East West 9,200 10,000 4,100 6,400 Product Alpha $12 $11 Product Omega $17 $15 Variable cost per unit: Product Alpha Product Omega $7 $7 $10 $10 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: % %