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Discussion :: Compound Interest

  1. Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is:

  2. A.

    Rs. 1550

    B.

    Rs. 1650

    C.

    Rs. 1750

    D.

    Rs. 2000

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    Answer : Option C

    Explanation :

    C.I.=Rs.[4000\( *(1+\frac { 10 } { 100 } )^2-4000]\)

       

         .=Rs.[4000x\( \frac { 11 } { 10 } \)x\( \frac { 11 } { 10 } \)-4000]

         

          =Rs.840

     

      Sum = Rs.\([ \frac { 420*100 } { 3*8} ]\)= Rs. 1750.


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