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 : 

A `3` 
B `4` 
C `5` 
D `6` 

+ Answer
B 

+ Explanation
`P(1 + 20/100)^n> 2p or (6/5)^n > 2`

Now `(6/5 xx 6/5 xx 6/5 xx 6/5) >2.` 

So, n = 4 years`

+ Report

Irin Moni

Editor, VCampus

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