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      Question

      Viru has Rs. 9000. He gives this money to Mahi on simple

      interest and after 4 years received the double amount. If the interest rate is 5% more than the previous, in how many years this amount will be doubled?
      A 3(1/3) years Correct Answer Incorrect Answer
      B 2(1/3) years Correct Answer Incorrect Answer
      C 6(1/3) years Correct Answer Incorrect Answer
      D 2(1/2) years Correct Answer Incorrect Answer

      Solution

      S.I = P x R x T/100 9000 = (9000 x r x 4)/100 r = 25% p.a New rate = 25 + 5 = 30% 9000 = 9000 x 30% x t t = 3(1/3) years

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