-14 E Snow Cap Springs produces and sells water filtration systems for homeowners. Information regarding its three models is shown below. Basic Basic Plus Premium Total Units sold 750 450 300 1,500 Unit selling price $250 $400 $800 Unit variable cost $195 $285 $415 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.