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      Question

      A sum doubles in 8 years at compound interest. In how

      many years will it become 4 times?
      A 12 yrs Correct Answer Incorrect Answer
      B 16 yrs Correct Answer Incorrect Answer
      C 22 yrs Correct Answer Incorrect Answer
      D 28 yrs Correct Answer Incorrect Answer

      Solution

      ATQ,

      (1+r)8 = 2 4 = 2² = (1+r)(16) So time = 16 years

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