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The weighted-average contribution margin of Helpful hardware which sells windows and doors is $216.
The weighted-average contribution margin can be calculated using the following formula:
Weighted-average contribution margin = (Contribution margin of windows * Percentage sales contribution of windows) + (Contribution margin of doors * Percentage sales contribution of doors) ……….. (1)
Where:
Contribution margin of windows = Selling price of each window - Variable cost of each window = $580 - $385 = $195
Percentage sales contribution of windows = 80%
Contribution margin of doors = Selling price of each door - Variable cost of each door = $1,180 - $880 = $300
Percentage sales contribution of doors = 20%
Substituting all the values into equation (1), we have:
Weighted-average contribution margin = ($195 * 80%) + ($300 * 20%) = $216
Therefore, the weighted-average contribution margin is $216.
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