Sandhill Corporation sells three different models of a mosquito "zapper." Model A12 sells for $60 and has unit variable costs of $42 Model B22 sells for $120 and has unit variable costs of $84. Model C124 sells for $480 and has unit variable costs of $360. The sales mix(as a percentage of total units) of the three models is A12, 60%; 822. 15 %; and C124, 25%. What is the weighted-average unit contribution margin? (Round answer to 2 decimal places, e.g. 15.50.) Weighted Average Unit Contribution Margin $