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NTSE Sample Paper NTSE SAT Practice Test-10

  • question_answer
    An amount at a certain rate of compound interest doubles itself in 4 years. In how many years will this amount become 8 times?

    A) 8                                 

    B) 12      

    C) 16                                

    D) 24

    Correct Answer: B

    Solution :

    [b] We have, \[n\text{ }\times \text{ }t\], where t is initial lime for double the amount (= 4 years) and n is given by, \[{{2}^{n}}=8={{2}^{3}}\,\,i.e.\,\,\,n=3\] So, required lime is \[3\times 4=12\]years    


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