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      Question

      At what rate of simple interest per annum will a sum of

      money become double in 12 years?
      A 6% Correct Answer Incorrect Answer
      B 8β…“% Correct Answer Incorrect Answer
      C 8% Correct Answer Incorrect Answer
      D 10% Correct Answer Incorrect Answer

      Solution

      ATQ, To double, Amount = 2P Simple Interest = A βˆ’ P = P SI formula: SI = (P Γ— R Γ— T)/100 P = (P Γ— R Γ— 12)/100 Cancel P (P > 0): 1 = (R Γ— 12)/100 R = 100 / 12 = 25/3 = 8β…“%

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