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SSC Sample Paper SSC CGL - Sample Paper-24

  • question_answer
    If a price of a book is first decreased by 25% and then increased by 20%, the net change in the price of the book will be

    A) 10% decrease    

    B) 5% decrease

    C) No change                    

    D) 5% increase

    Correct Answer: A

    Solution :

    Here, \[{{r}_{1}}=25%\] and \[{{r}_{2}}=20%\] \[\therefore \] Net change \[=\left( {{r}_{1}}+{{r}_{2}}+\frac{{{r}_{1}}{{r}_{2}}}{100} \right)%\]             \[=\left( -25+20+\frac{25\times 20}{100} \right)%\]             \[=(-\,5-5)%\]             \[=-\,10%\] \[\therefore \] Change in the price of the book is 10% decrease.


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