Crane Cap Springs produces and sells water filtration systems for homeowners. Information regarding its three models is shown below. The company's total fixed costs to produce the filtration systems are $128,007. (a) Determine the sales mix as a function of units sold for the three products. Your answer is correct. Determine the sales mix as a function of units sold for the three products. (b) Determine the weighted-average unit contribution margin. (Round answer to 2 decimal places, es. 10.25.) Weighted-average unit contribution margin