陈向东机考模拟101

celinesafina

Mr. Daniels deposits $ 10,000 in a savings certificate earning p percent annual interest compounded quarterly. What is the value of p?

(1) During the term of the certificate, he earns $ 18 more than he would if the interest were not compounded.

(2) He withdraws all the money six months after depositing it.

这一题答案是C，我列的式子是10000（1+p%/4）^2-10000(1+p%)*6=18。

首先，不知道这个式子对不对。有一点我搞得不是很清楚：第二个p%需要除以4吗？

另外，这一题真的要把p解出来才做得出来吗，不然的话这是个二次方程我觉得p应该有2个值所以应该选E呀。可是如果真要解的话岂不是要花很多时间？或者说根本是这个思路不对？

请nn们释疑，先谢过！

baby1986

10000（1+p%/4）^2-10000（1+p%/4 *2）= 18

只是我的想法，也不知道对不对，只供你参考一下吧。