Helpful Hardware sells windows (80\% of sales) and doors (20\% of sales). The selling price of each window is $740 and of each door is $1,340. The variable cost of each window is $505 and of each door is $1,040, Fixed costs are $2,005,080. The break-even point in units using the weighted-average contribution margin is: Multiple Cholce . 5,920 units 16,080 units. 7,925 units 10,744 units. 8,085 units.