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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 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?
  (A) 1/2 (B) 1/3 (C) 1/4 (D) 1/5 (E) 1/6
  为什么是D 不太明白~ |   
 
 
 
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