Alice's take-home pay

heng20082002 · 发表于 2010-6-24 19:26:26

来问一下prep上的一道原题。。。这个题看的不是很懂的样子。。。谢谢。。。大家加油再看一会儿世界杯就开始了。。。
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

crazyxxx · 发表于 2010-6-24 20:39:42

每个月从takehome pay拿出固定比例的钱存下来,到了年底,存了的钱=每个月takehome pay里未存的那部分的3倍.
set th pay = x , save y%
x * y % * 12 = 3 * x * ( 1 - y % )
=>y%=20%=1/5

Alice's take-home pay

所属分类: GMAT考试

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