a,b,c=input(),list(map(int,input().split())),list(map(int,input().split()))
total=0
for i,v in enumerate(c):
if 90<=v<=100:total+=b[i]*4
elif 85<=v<=89:total+=b[i]*3.7
elif 82<=v<=84:total+=b[i]*3.3
elif 78<=v<=81:total+=b[i]*3
elif 75<=v<=77:total+=b[i]*2.7
elif 72<=v<=74:total+=b[i]*2.3
elif 68<=v<=71:total+=b[i]*2
elif 64<=v<=67:total+=b[i]*1.5
elif 60<=v<=63:total+=b[i]*1
else:total+=b[i]*0
print("{0:.2f}".format(total/sum(b)))
学分绩点
最新推荐文章于 2021-07-30 07:46:07 发布