=IF(B9<0,"0",IF(B9<=500,"0.05",IF(B9<=2000,"0.10",IF(B9<=5000,"0.15",IF(B9<=20000,"0.20",IF(B9<=40000,"0.25",IF(B9<=60000,"0.30",IF(B9<=80000,"0.35",IF(B9<=100000,"0.40","0.45")))))))))老是报错,迷惑不解