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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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“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.”
年底存钱总数 = 每个月没存的钱的 3 倍
12 * t% * m = 3 * (1-t%) * m
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