Compound Interest

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

ANS:B - 4

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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