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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