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      Question

      An amount becomes 2.5 times itself in 15 years at a

      simple interest rate of r% per annum. Find r.
      A 10 Correct Answer Incorrect Answer
      B 48 Correct Answer Incorrect Answer
      C 25 Correct Answer Incorrect Answer
      D 55 Correct Answer Incorrect Answer

      Solution

      Let the amount invested be Rs. x According to the question, (x × r × 15)/100 = 2.5x – x Or, r = 10

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