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      Question

      A sum of money doubles itself in 5 years at simple

      interest. What is the rate of interest per annum?
      A 10% Correct Answer Incorrect Answer
      B 12% Correct Answer Incorrect Answer
      C 15% Correct Answer Incorrect Answer
      D 20% Correct Answer Incorrect Answer

      Solution

      Let the principal be P, and the rate be R%. The amount after 5 years = 2P. Using the formula for simple interest: Amount = P(1 + rt/100), 2P = P(1 + 5R/100). Solving, we get R = 20%. Correct Option: d) 20%

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