下面是一道SAT数学练习题，是关于银行的利率方面的内容，但是题目相对比较简单。大家在备考自己的SAT数学考试的时候，一定要多加练习相关的题目，这样才能理解SAT数学考试的出题方式和专业的词汇，才更有可能拿到高分成绩。
Alison deposits 
into a new savings account that earns 
percent interest compounded annually. If Alison makes no additional deposits or withdrawals, how many years will it take for the amount in the account to double?
Answer Choices
(A) 
(B) 
(C) 
(D) 
(E) 
The correct answer is B
Explanation
Difficulty: Medium
After 
year, the amount in the account is equal to 
. After 
years, the amount is equal to 
, and so on. After 
years, the amount is equal to 
. You need to find the value of 
for which 
. There are several ways to solve this equation. You can use logarithms to solve the equation as follows.
Since 
, it will take more than 
years for the amount in the account to double. Thus, you need to round 
up to 
.
Another way to find 
is to use your graphing calculator to graph 
and 
. From the answer choices, you know you need to set the viewing window with 
values from 
to about 
and 
values extending just beyond 
. The 
of the point of intersection is approximately 
. Thus you need to round up to 
.
以上就是这道SAT数学练习题的全部内容，来自SAT考试官方网站，后面附有详细的答案解析和难度提示。大家可以在备考SAT数学考试的时候对上面的题目进行适当的练习和参考借鉴。
更多SAT数学相关：
6道SAT数学练习题
SAT数学练习题六道(代数)
两道SAT数学题目
