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      Question

      An amount becomes eight times of itself in 56 years at

      simple interest. Find the value of (6R − 25).
      A 70 Correct Answer Incorrect Answer
      B 30 Correct Answer Incorrect Answer
      C 45 Correct Answer Incorrect Answer
      D 50 Correct Answer Incorrect Answer

      Solution

      Let the amount invested be Rs. 'p'.
      Interest earned = 8p − p = Rs. 7p
      Simple interest = Principal × Rate × Time ÷ 100
      So, 7p = p × R × 56 ÷ 100
      Or, R = (7 × 100) ÷ 56 = 12.5
      Required value = 6 × 12.5 − 25 = 75 − 25 = 50

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