又一道prep的题

liuqiangde

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 her monthly take-home pay that she did not saved. 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

B1/3

C1/4

D1/5

E1/6

答案是D，请问这道题是什么意思，没看懂。xiexie

jikuren

ALICE去年把每月工资（TAKE HOME PAY)存同样%，到年底止存的钱是一个月未存钱的3倍，问她每月存钱是TAKE HOME PAY的比例。
设每月未存钱X，
X/(X+3X/12)=4/5,
所以存钱的比例是1/5。