Ahmed & Co. makes and sells two types of shoes, Plain and Fancy. Data concerning these products are as follows: Unit selling price Variable cost per unit Plain $ 21.00 10.00 Fancy $32.00 28.00 Sixty percent of the unit sales are Plain, and annual fixed expenses are $57,400. The weighted-average unit contribution margin is: (Round intermediate calculations and final answer to 2 decimal places) Multiple Choice $4.00 $8.20. $8.45 $16.20. None of the answers is correct