Contribution Margin by Segment The following information is for Moss Creek Apparel: Line Item Description East West Sales volume (units): Product Alpha 8,700 8,500 Product Omega 4,600 8,500 Sales price: Product Alpha $12 $13 Product Omega $15 $17 Variable cost per unit: Product Alpha $7 $7 Product Omega $9 $9 a. Determine the contribution margin for the East Region and West Region. East Region: fill in the blank 1 of 2$ West Region: fill in the blank 2 of 2$ 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: fill in the blank 1 of 2 % West Region: fill in the blank 2 of 2 %