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Let the principal be Rs.x
Time=25/4 years.
Using SI=P*R*T/100,we get
Answer:It will double itself in 25/4 years(6 years 3 months) at 16% p.a.

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Simple interest case:

Sum doubles if Sum = Principal + interest  = 2 P   => interest = principal

      Interest = principal = P = P r t       = >   r t  = 1

            r = 1/t = 4/25 or  (4/25) * 100% = 16% per year

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hope it is easy to understand
thanx n r welcom
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