Answer:
Contribution Margin = 25.94%
Explanation:
Contribution Margin = Contribution / Sales
Calculation of Contribution per unit :
Contribution = Sales less Variable Cost
Sales price                                     $41.17
Less Variable Costs :
Variable cost of goods sold (13.17  + (13.17  × 15%))     ($15,15)
Variable selling expenses                        ($11.77 )
Variable administrative expenses                  ($4.17)
Contribution                                   $10.68
Therefore, Contribution Margin = $10.68 / $41.17 × 100 = 25.94%