SAT数学练习题一道.

　　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。

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