解：设原来的利润为a%，售价x，原进价y,则现进价（1-5%）y=0.95y(x-y)/y = a%(x-0.95y)/0.95y = (a+15)%(x-0.95y)/0.95y - (x-y)/y = 15%得：x=(57/20)y所以，(x-y)/y = [x-(20/57)x]/(20/57)x = a%经化简，得：a% =185%
