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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-22

  • question_answer
    A student multiply a number by  \[\frac{4}{5}\] in place of \[\frac{5}{4},\] then percentage of error in his calculation will be -

    A)  \[20%\]                        

    B)  \[25%\]

    C)  \[14\frac{2}{7}%\]                  

    D)  \[36%\]

    Correct Answer: D

    Solution :

     Let the number is x Error \[=\frac{5x}{4}-\frac{4x}{5}=\frac{25x-16x}{20}=\frac{9x}{20}\] \[\therefore \]  % error  \[=\frac{\frac{9x}{20}\times 100}{\frac{5x}{4}}=\underline{\mathbf{36%}}\]


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