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Question

A sum of Rs. 12,000 deposited at compound interest becomes double after 5 years. After 20 years, it will become:

Options:
A .  96000
B .  120000
C .  124000
D .  192000
E .  None of these
Answer: Option D
 -   12000 x  ( 1+ R )  5  = 24000 =>  ( 1+ R  ) 5 = 2         100 100              (  ( 1+ R  ) 5 100 )  4  = 24 = 16    ( 1+ R  ) 20 100  = 16   P ( 1+ R )  20 100  = 16P        12000  ( 1+ R  ) 20  = 16 x 12000 = 192000    

100

       
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