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      Question

      A sum doubles in 9 years at simple interest. Find the

      rate of interest per annum is.
      A 10% Correct Answer Incorrect Answer
      B 11(1/9)% Correct Answer Incorrect Answer
      C 10(1/9)% Correct Answer Incorrect Answer
      D 13% Correct Answer Incorrect Answer

      Solution

      9years =2times Rate = [(2-1)/9] ×100=100/9=11(1/9)%

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