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Lowes sells windows (60\% of sales) and doors (40\% of sales). The selling price of each window is $200 and of each door in 5500 . The variable cost of each window is $125 and of ech 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. Compute the number of units of each product that will be sold at the break-even point