Question

A sum of money invested at compound intrest doubles itself in 4 years ,intrest being payable annually . In how much time will it be eight times

Answer 1

Answer:

12 years

Step-by-step explanation:

Let me explain u with an example

I deposited 1 rupee

In 4 years I have 2 rupee

Now I have 2 rupee

In 4 more years it became 4 rupee

Now i have 4 rupee in 4 more years it became 8 rupee

So I have total eight times money of the previous amount

Total time =4+4+4=12years