Ivanhoe Corporation sells three different models of a mosquito "zapper." Model A12 sells for $54 and has unit variable costs of 539. Model B22 sells for $108 and has unit variable costs of $76. Modet C124 sells for $432 and has unit varlable costs of $324. The sales mix(as a percentage of total units) of the three models is A12, 60N; B22, 15\%, and C124,25\% What is the weighted-average unit contribution murgin? (Round answer to 2 decimal places, es. 15.50) Weighted-Average Unit Contribution Margin $