求助一道数学题~

雪薇 · 发表于 2010-2-2 23:46:54

sb'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 monthy take-home pay that she did not save. if all the money that she saved last year was form her take-home pay. what fraction her take-home pay did she save each month.

题意看不是太明白，求助各为高手解答一下~

雪薇 · 发表于 2010-2-3 00:44:58

这是prep的题，知道虽然有点麻烦，可还是诚信求教~

lipsilon · 发表于 2010-2-3 00:50:13

Assume take-home pay per month is x, and k is the percentage of x to be saved.

12*kx = 3*12(1-k)x -> k=3/4

雪薇 · 发表于 2010-2-4 16:20:55

这个。。。。。

不好意思，还是没看明白，答案貌似1/5的

求助一道数学题~

Try

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