SOLUTION: a certain sum of money doubles itself at simple interest in 8 years. in how many years will it be three times at the same rate?

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Question 522879: a certain sum of money doubles itself at simple interest in 8 years. in how many years will it be three times at the same rate?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
principal =x
Interest =x
x= x*8*r/100
r=100/8
--------------=
2x= x*n*100/8 *1/100
2=100n/800
1600=100n
n= 16 years