求教求教

bhchka

62.    7564-!-item-!-187;#058&005577
Alice's take-home pay last year was the same each month, and she saved the same fraction of her take-home pay each month.  The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take-home pay that she did not save.  If all the money that she saved last year was from her take-home pay, what fraction of her take-home pay did she save each month?

(A) 1/2
(B) 1/3
(C) 1/4
(D) 1/5
(E) 1/6

cola5117

这题重在看懂题目啊.. 就说A 每个月都存其薪水的一部分.然后这一整年存下来的钱是她一个月没有存下来的那部分的钱的三倍
然后设每月薪水1元（这个没影响），每月存的部分则为 x
那么有 12x = 3(1-x) 得出 x=1/5

bhchka

多谢啦