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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 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 saved each month?
A1/2
B1/3
C1/4
D1/5
E1/6
答案是D 为什么呢?
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