Explain how to solve (D) please!!

Current Attempt in Progress Carla Vista 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 $170,324. (a) Determine the sales mix as a function of units sold for the three products. Determine the weighted-average unit contribution margin. (Round answer to 2 decimal places, e.g. 10.25.) Weighted-average unit contribution margin $ (c) Your answer is correct. Determine the total number of units that the company must produce to break even. E Your answer is incorrect. Determine the number of units of each model that the company must produce to break even