prep DS1 144题，求NN帮我解答

zdkdl · 发表于 2010-1-28 22:08:24

If $1,000 is deposited in a certain bank account and remains in the account along with any accumulated interest, the dollar amount of interest, I , earned by the deposit in the first n years is given by the formula I
=1000〔(1 + r/100)ⁿ - 1〕, where r percent is the annual interest rate paid by the bank. Is the annual interest rate paid by the bank greater than 8 percent?

(1) The deposit earns a total of $210 in interest in the first two years.

(2) ( 1 + r/100)² > 1.15

我觉得2这个式子从理论上能够算出r的值，既然能够计算出r，那么就可以跟8比较大小啊，为什么答案是A呢，哪位大NN能帮忙解答一下啊

zdkdl · 发表于 2010-1-29 13:13:16

哪位NN能帮一下忙啊

dengts · 发表于 2011-2-19 18:59:04

我问你，如果r解出来大于百分之七，你能判断么？

prep DS1 144题，求NN帮我解答

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