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      Question

      A certain sum becomes 3.5 times itself in 10 years at

      simple interest. Find the rate of interest.
      A 25% Correct Answer Incorrect Answer
      B 45% Correct Answer Incorrect Answer
      C 18% Correct Answer Incorrect Answer
      D 10% Correct Answer Incorrect Answer

      Solution

      Let the sum be Rs. x (x Γ— r Γ— 10) / 100 = 3.5x – x β‡’ 10xr / 100 = 2.5x β‡’ r = 25 Rate of interest = 25% per annum

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