D Question 12 4 pt- Helpful Hardware sells windows (80% of sales) and doors (20% of sales). The selling price of each window is $560 and of each door is $1.160. The variable cost of each window is $370 and of each door is $860, Fixed costs are $1,704,480. The break-even point in units using the contribution margin is O 4,480 units O 8040 units 13.920 units O 8,687 units 6.553 units. weighted-averin