Helpfil Hardware sells windows (80\% of sales) and doors (20x of sales). The seling pice of each window is $600 and of each door is $1,200. The variable cost of each windew is $400 and of eacti door is $900. Fiwed costs are $1,771,000. The weighted-average contribution margin is: Muitiple chioke sin0,0 5270 $180 $369 $220