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      Question

      A certain amount doubles itself when invested at r% p.a.

      simple interest for 10 years. Find the value of r.
      A 10 Correct Answer Incorrect Answer
      B 12 Correct Answer Incorrect Answer
      C 24 Correct Answer Incorrect Answer
      D 32 Correct Answer Incorrect Answer

      Solution

      Let the principal be Rs. x According to the question, (x × r × 10)/100 = 2x – x Or, r = 10

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