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7th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer
    Find the principal if S.I. is Rs.31.50, time period is \[1\frac{1}{4}\]. years and rate percent per annum is \[5\frac{1}{4}%\].

    A)  Rs.460                 

    B)         Rs.430                 

    C)  Rs.480                   

    D)         Rs.4800

    Correct Answer: C

    Solution :

     S.I \[=Rs.\,\,31.50\] \[T=1\frac{1}{4}\]years \[=\frac{5}{4}\]years \[R=5\frac{1}{4}%=\frac{21}{4}%\] \[\Rightarrow \] \[31.50=P\times \frac{5}{4}\times \frac{21}{400}\] \[\Rightarrow \] \[P=Rs.\,31.50\times \frac{4\times 400}{5\times 21}\] \[\Rightarrow \] \[P=Rs.\,480\]


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