Ahmed & Co. makes and sells two types of shoes, Plain and Fancy. Data concerning these products are as follows: Plain Fancy Unit selling price $25.00 $33.00 Variable cost per unit 13.00 24.00 Sixty percent of the unit sales are Plain, and annual fixed expenses are $81,000. The weighted-average unit contribution margin is: (Round intermediate calculations and final answer to 2 decimal places) Multiple Choice O $6.60. O $10.80. O $11.05. O $18.80. O None of the answers is correct