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 weighted-average contribution margin is:

a.$535.

b.$312.

c.$222.

d.$423.

e.$248.