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      Question

      A certain sum of money earns Rs. 360 as Simple Interest

      and Rs. 381.6 as Compound Interest over a period of 2 years. What is the rate of interest?
      A 12% Correct Answer Incorrect Answer
      B 20% Correct Answer Incorrect Answer
      C 14% Correct Answer Incorrect Answer
      D 16% Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let, rate of interest and principle amount be β€˜r%’ per annum and Rs. β€˜P’, respectively. Compound interest = P Γ— {(1 + r/100)2 – 1} = 381.6 Simple interest = (P Γ— r Γ— 2)/100 = 360 So, P Γ— {(1 + r/100)2 – 1} - (P Γ— r Γ— 2)/100 = 381.6 – 360 Pr2/10000 = 21.6 Pr = 216000/r So, (P Γ— r Γ— 2)/100 = 360 216000/r Γ— 2 = 36000 r = 12

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