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

1.

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

[A].	3
[B].	4
[C].	5
[D].	6

Answer: Option B

Explanation:

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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