DOIT! 6.2 (LO 2), AP Snow Cap Springs produces and sells water filtration systems for homeowners. Compute sales mix, weighted-overoge Information regarding its three models is shown below. contribution margin, and breakeven point. The company's total fixed costs to produce the filtration systems are $180,700. a. Determine the sales mix as a function of units sold for the three products. b. Determine the weighted-average unit contribution margin. c. Determine the total number of units that the company must produce to break even. d. Determine the number of units of each model that the company must produce to break even