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Question
A sum of money triples itself in twelve years at simple interest. Find the rate of interest?
Options:
A .  12 1/2 % p.a.
B .  14 4/7 % p.a.
C .  15 2/3 % p.a.
D .  13 3/8 % p.a.
E .  None of these
Answer: Option E


Let the pricipal be Rs. x, then amount = 3x(where R = rate of interest) => Interest = 3x - x = Rs. 2xR = (100 * 2x)/(x * 12) = 50/3 % = 16 2/3 %


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