数学 一题

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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

时间造物

设每月收入为x，每月存款y，每月不存的则为，x-y，则按题意

12y=3(x-y),则y/x=1/5

选D

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