Sandhill Corporation sells three different models of mosquito "zapper." Model A 12 sells for $50 and has variable costs of $35. Model B22 sells for $140 and has variable costs of $115. Model C124 sells for $495 and has variable costs of $385. The sales mix of the three models is as follows: A 12, 60%; B22, 25%; and C124, 15%. (a) What is the weighted-average unit contribution margin? (Round answer to 2 decimal places, e.g. 15.25.) Weighted-average unit contribution margin