Subject

    Quantitative Aptitude

    Topic

    Percentage

    A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in evaluation ?

    ক)
    52%
    খ)
    64%
    গ)
    84%
    ঘ)
    77%

    Explanation

    Let the number be 'x' Then, according to the given data, 52x−25x52x×100\frac{\displaystyle\frac{\mathbf5}{\mathbf2}\mathbf x\boldsymbol-\frac{\mathbf2}{\mathbf5}\mathbf x}{\displaystyle\frac{\mathbf5}{\mathbf2}\mathbf x}\times\mathbf{100} = 2125×100\frac{21}{25}\times100 = 84%

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