The least number of complete years in which a sum of money put out at 20% compou

Question

The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is:

Options:

A . 3

B . 4

C . 5

D . 6

Answer: Option B

P

1 +
20

n
> 2P

6

n
> 2.
100
5

Now,

6
x
6
x
6
x
6

> 2.
5
5
5
5

So, n = 4 years.

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