A sum of money invested at compound interest triples itself in six years. In how many years will it become 81 times itself at the same rate of compound interest?
1
24 years
2
20 years
3
15 years
4
18 years
5
None of these
A sum of money invested at compound interest triples itself in six years. In how many years will it become 81 times itself at the same rate of compound interest?