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?
A1/2
B1/3
C1/4
D1/5
E1/6
I really do not know the why the answer is D.I think the faction of her take home pay she save should be 3/4.