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?
x= monthly pay.
xy/100 = savings per month.
12xy/100= 3(x-xy/100) (12xy/100)/(12x)=?
12xy/100=(300x-3xy)/100 --> 12xy=300x-3xy 15xy=300x y=300/15 y=20...
(12x*20/100)/12x ---> 20/100--> 1/5