Lowes sells windows (60% of sales) and doors (40% of sales). The selling price of each window is $200 and of each door is $500. The variable cost of each window is $125 and of each door is $350. Fixed costs are $367,500. Required: a. Compute weighted-average contribution margin. b. Compute break-even point in units using the weighted-average contribution margin. c. Compute the number of units of each product that will be sold at the break-even point