设标价为x元,成本y元,最后按m折出售可使销售该品牌服装每件获得20%的利润。解题如下:0.6x=y-10,0.8x=y+70.解答得x=400,y=250,400m=250+250*0.2=>m=0.75.故当标价的7.5折出售可使销售该品牌服装每件获得20%的利润。望采纳
设单价x,成本为y0.6x+10=y0.8x-70=y解得x=300 y=1701.2*170=2147.5折吧