Ivanhoe Corporation sells three different models of mosquito "zapper." Model A12 sells for $50 and has variable costs of $35. Model B22 sells for $105 and has variable costs of $70. Model C124 sells for $425 and has variable costs of $315. The sales mix of the three models is as follows: A12, 50\%; B22, 15\%; and C124, 35%. (a) What is the weighted-average unit contribution margin? (Round answer to 2 decimal places, e.g. 15.25.)