19. BE 21.05.ALGO Algorithmic) Contribution Margin by Segment The following data are for Elm Leaf Apparel: East West Sales volume (units): Product XX 8,300 7,700 Product YY 6,100 9,500 Sales price: Product XX $18 $ $19 Product YY $22 $21 Variable cost per unit: Product XX $11 $11 Product YY $13 $13 a. Determine the contribution margin for Product YY. $ b. Determine the contribution margin for the West Region. $