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### Discussion :: Compound Interest

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:

2.  A. 3 B. 4 C. 5 D. 6

Explanation :

P$$[ 1+\frac { 20 } {100 } ]^n$$greater than2P$$(\frac { 6} { 5 } ) ^n$$greater than2

Now,[$$\frac { 6} { 5 } *$$$$\frac { 6} { 5 } *$$$$\frac { 6} { 5 } *$$$$\frac { 6} { 5 } *$$]greater than2

So, n = 4 years.

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