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标题: GWD-30-M-10 [打印本页]

作者: luckg 时间: 2006-8-30 22:19
标题: GWD-30-M-10

Q10:

$10,000 is deposited in a certain account that pays r percent annual interest compounded annually, the amount D(t), in dollars, that the deposit will grow to in t years is given by D(t) = 10,000 {1+(r/100)}^t. What amount will the deposit grow to in 3 years?

(1) D(t) = 11,000

(2) r =10

Key is D.

可是（1）怎么可以算得出来呢？因为有两个未知数，t和r，但是只有一个等式呀

作者: listen2000 时间: 2006-8-30 23:00
I agree,(1) is insufficient.

作者: heatostrich 时间: 2006-8-31 15:20
答案应该是对的吧~知道本金知道利率知道了年限就可以求出答案了阿，题干本身给出了本金和年限，给出利率就可以知道答案了，所以2)是对的，1）不是就是直接给出答案呢？

作者: bluegold998 时间: 2006-8-31 21:05

对呀，1应该有问题吧，如果是直接给答案，应该是D（3）＝11000才对呀。

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