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Railways Quantitative Aptitude Percentage Sample Paper Percentage Sample Test Paper-8

  • question_answer
    A man's working hours per day were increased by 20% and his wages per hour were increased by 15%. By how much percent are his earnings (daily wages) increased?

    A)  38%                

    B)  39%

    C)  40%    

    D)  19%

    Correct Answer: A

    Solution :

    [a] Let the working hour/day (initially) = x wages / hr = Rs. y \[\therefore \] Daily income = xy After increase Working hr/day\[=x+\frac{20}{100}x=\frac{6x}{5}\] Wages/hr\[=y+\frac{15}{100}y=\frac{23}{20}y\] Daily income \[=\frac{6x}{5}\times \frac{23}{20}y=\frac{138}{100}xy\] % increase in daily income \[=\left[ \left( \frac{\frac{138}{100}xy-xy}{xy} \right)\times 100 \right]%\] \[=\left( \frac{38}{100}\times 100 \right)%=38%\]


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