Russell Corporation sells three different models of mosquito "zapper." Model A12 sells for $56 and has variable costs of $37. Model B22 sells for $106 and has variable costs of $73. Model C124 sells for $419 and has variable costs of $306. The sales mix of the three models is: A12, 60%; B22, 25%; and C124, 15%. What is the weighted-average unit contribution margin? (Round computations and final answer to 2 decimal places, e.g. 15.50.) $