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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-5

  • question_answer
    The length and breadth of a rectangle are doubled. Percentage increase in area is

    A)  400%                        

    B)  150% 

    C)         200%            

    D)         300%             

    Correct Answer: D

    Solution :

    \[A=\ell b\] \[A'=(2\ell )\,(2b)=4\ell b=4A\] % Change \[=\frac{4A-A}{A}\times 100=300%\]


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