Answer:
It will take 12years to triple itself
Step-by-step explanation:
let the sum of money=x
In 8years x becomes 2x
thus
2x-8years
Then 3x-?
Using ratio and proportion,
x=3/2×8years=12years
I think it is
4,8,5,15,6,12,7,6
8,5,15,6,12,7
5,15,6,12
15,6
15+6=21
D
i hope that helps......