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标题: 一道数学难题 [打印本页]

作者: bastencools 时间: 2007-2-26 08:18 标题: 一道数学难题

Laura borrowed $2400 from her parents to pay for hte college education . If she pays back 2.5 percent of this amount quarterly , and has paid back $420, for how many months has she been paying back her loan .

A 6

B 7

C 21

D 24

E 28

答案是C哦，怎么做的呢》

作者: wenchongjie 时间: 2007-2-26 21:22

Laura每季（即每3个月）付2400 * 2.5%=60，已经付了420，也就是付了7个季，所以是21个月咯.

作者: liushuixian 时间: 2007-2-27 20:56

我个人是这么认为的：
每季度还2400的2.5%,即，60，
即每个月还20，
即420还了21个月，
不知对不对？

作者: taotaobao 时间: 2007-3-7 07:18

AGREE!!!!!!!!!!

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