No Fly Corporation sells three different models of a mosquito "zapper." Model A12 sells for $55 and has variable costs of $40. Model B22 sells for $107 and has variable costs of $79. Model C124 sells for $414 and has variable costs of $307. The sales mix of the three models is A12, 55%; B22, 29%; and C124, 16%. What is the weighted-average unit contribution margin