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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-14

  • question_answer
    A shopkeeper advertises for selling cloth at 4% loss. However, by using a false metre scale he actually gains 25%. What is the actual length of the scale?

    A)  80 cm

    B)  70 cm

    C)  90 cm 

    D)  75 cm

    Correct Answer: A

    Solution :

    Error = x%, Gain% \[=\frac{\text{Error}}{\text{True}\,\,\text{value}-\text{Error}}\times 100\] \[\Rightarrow \,\,\]           \[25=\frac{x}{100-x}\times 100\] \[\Rightarrow \,\,\]           \[100-x=4x\Rightarrow \,\,5x=100\] \[\Rightarrow \]               \[x=20\] \[\therefore \]Scale used \[=100-20=80\,\,\text{cm}\]


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