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The least no 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 or D. 6............. PLS ANS FAST


The Brainliest Answer!
Let sum invested = P for t years.
A sum will be doubled if interest = principal = P. Amount = P+P = 2p.
Amount 2P = Px[1 + (20/100)]^t  
 Hence [1 + (20/100)]^t = 2 
or (1.21)^t = 2
LHS is greater than two when t = 4 
Hence sum will be more than doubled if it is invested for 4 years.
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