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题库 / Prep2007E1-PS-62
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?
~$\frac{1}{2}$~
~$\frac{1}{3}$~
~$\frac{1}{4}$~
~$\frac{1}{5}$~
~$\frac{1}{6}$~
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是单月未存量的3倍，而非单月未存总量的3倍
年底存钱总数 = 每个月没存的钱的 3 倍
12 * t% * m = 3 * (1-t%) * m
12*save each month=3*not save each month
save each month+not save each month=1
年末，她存下的钱，是她每月收入中没存的钱的三倍
她去年省下的所有钱都是来自她的收入，她每月省下了收入的分数？
设月薪y，所求为 X，12*y*X=3*（y—y*X），X=1/5
每个月存钱为x,没存的部分为y，12x=3y,y=4x
x/(x+y)=1/5
年末，她存下的钱，是她每月收入中没存的钱的三倍
她去年省下的所有钱都是来自她的收入，她每月省下了收入的分数？