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Railways Sample Paper RRB (Group D) Sample Test Paper-11

  • question_answer
    The length and breadth of a rectangle are 20 m and 15m respectively. If length is increased by 20% and the breadth by 30%, the percentage increase in its area is

    A)  54%                

    B)  56%

    C)  50%    

    D)  52%

    Correct Answer: B

    Solution :

    [b] Area of rectangle, \[A=20\,\,m\times l5\,\,m=\text{ }300\,\,{{m}^{2}}.\] Increased area.  A'=\[\left( 20+\frac{20}{100}\times 20 \right)\,\,\left( 15+\frac{30}{100}\times 15 \right)\] \[=24\times 19.5=\text{ }468\,\,{{m}^{2}}.\] % increase in area = \[\frac{468-\,300}{300}\times 100=56%\]


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