跪求好心人一道GWD数学

Gracebeauty17

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

这道题选A吧,答案选D,但条件2推不出来

coco2111

我觉得条件2推不出来，刚才算了一下，r=8也符合条件。

treewing929

為何是 D??

1.15 ^1/2 大約等如 1.07
所以, r/100 >7%
>7% 不等如 >8%

同求!!

xiaohanhenry

这题的答案就是A  我PREP里面做到过  REP的答案就是A