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      Question

      6 copies of a book can be bought for a certain sum

      payable at the end of a year, and 7 copies of the same book can be bought for the same sum in cash money. What is the rate per annum of simple interest (correct to one decimal place)?
      A 10.9% Correct Answer Incorrect Answer
      B 15.5% Correct Answer Incorrect Answer
      C 16.7% Correct Answer Incorrect Answer
      D 30.4% Correct Answer Incorrect Answer

      Solution

      The correct answer is C

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