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      Question

      An amount becomes four times of itself in 30 years at

      simple interest. Find the value of (7R βˆ’ 40).
      A 70 Correct Answer Incorrect Answer
      B 30 Correct Answer Incorrect Answer
      C 45 Correct Answer Incorrect Answer
      D 20 Correct Answer Incorrect Answer

      Solution

      Let the amount invested be Rs. 'p'.
      Interest earned = 4p βˆ’ p = Rs. 3p
      Simple interest = Principal Γ— Rate Γ— Time Γ· 100
      So, 3p = p Γ— R Γ— 30 Γ· 100
      Or, R = (3 Γ— 100) Γ· 30 = 10
      Required value = 7 Γ— 10 βˆ’ 40 = 70 βˆ’ 40 = 30

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