85*0.2/100+90*0.25/100+90*0.55/100=0.89其实就是85*0.2+90*0.25+90*0.55=8989分
89
85*20%+90*25%+90*55%=89(分)最后得分是89分
85*20% =1790*25% =22.590*55%=49.5所以小秋最后得分是17+22.5+49.5=89