一道与本月热点狗狗11类似的GWD利息题目，请求指教

hukeab

GWD19-Q10
If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as I = 1000 {(1 + r/100)ⁿ – 1}, and the annual interest rate is r percent, is r > 8 percent?
(1)The deposit earns a total of $210 in interest in the first 2 years.
(2)(1 + r/100)² > 1.15


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: D
关于条件一，可以确定充分，但是条件二，不充分啊。当r=8 时候（1+r)的平方应该是1.166，所以2不能确定r>8，求指点，麻烦同学们帮忙看看我的问题在哪里，多谢了~答案是D,我觉得是A


再问句题外话，有的大牛考数学提前做完，最后一题就不点确定，坐着休息，这样可以吗？不会影响到最后一题的分数吧~恳请了解的同学指点一下

santaalex

这题就是A

hukeab

这题就是A

-- by 会员 santaalex (2010/7/5 23:25:22)

是吧，我也觉得~难道GWD的答案也有错的时候~多谢santaalex同学指点！