The following data are for trendy Fashion apparel North South sale volume(units) Bouses 5000 5000 skirts 4000 8000 sales price: blouses $20.00 $22.00 skirts $18.00 $ 20.00 variable cost per unit blouses $7.00 $9.00 skirts $9.00 $11.00 Determine the contribution margin for the follwing a.) Skirts $_______________ b.) The south Region $___________________