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      Question

      At a certain rate of simple interest, a sum becomes five

      times of itself in 32 years. What is the value of (5R - 18)?
      A 42 Correct Answer Incorrect Answer
      B 90 Correct Answer Incorrect Answer
      C 58 Correct Answer Incorrect Answer
      D 32 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the principal be Rs. 'P'.

      Interest earned = 5P - P = Rs. '4P'

      Using SI formula: 4P = P × R × 32 ÷ 100

      ⇒ R = 12.5

      Required value = 5 × 12.5 - 18 = 44.5

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