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7th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer
    Find the principal if S.I. is Rs.50, time period is \[2\frac{1}{4}\] years and rate percent per annum is\[1\frac{1}{2}%\].

    A) \[Rs.\,\,1582\]                            

    B) \[Rs.\,\,1430\frac{26}{27}\]

    C) \[Rs.\,\,1481\frac{13}{27}\]       

    D) \[Rs.\,\,1300\]

    Correct Answer: C

    Solution :

    (c) S.I. \[=Rs.\,\,50.0\] \[T=2\frac{1}{4}\] years\[=\frac{9}{4}\] years \[r=\frac{3}{2}%\] \[\Rightarrow \]\[50=P\times \frac{9}{4}\times \frac{3}{200}\] \[\Rightarrow \]\[P=50\times \frac{4}{9}\times \frac{200}{3}\] \[=\frac{40000}{27}=1481\frac{13}{27}\]


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