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标题: 数学难题集锦-Preview3-数学难题 [打印本页]

作者: lemonees    时间: 2005-8-13 06:57     标题: 数学难题集锦-Preview3-数学难题


Laura borrowed $2400 from her parents to pay for her college education. If she pays back 2½ percent of this amount quarterly, and she has paid back $420, for how many months has she been paying back for her loan?

A. 6; B 7; C. 21: D. 24; E. 28.

The answer is C.

请问NN, 这题该怎么计算。 非常感谢


作者: sammen    时间: 2005-8-13 12:32

呵呵,这个题目前几天刚有人问过。关键是对quarterly的理解,每季度也就是3个月。2400*2.5%=60那么420/60=7个季度=21个月。
作者: himba    时间: 2005-8-13 20:23

这里主要是quarterly的理解,quarterly=一年四次的,每季度的;

2400*0.025=60;

420/60=7;所以出现了7次季度性支付;

一个季度有3个月,7*3=21






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