Multiple Choice Questions on If each side of a square is increased by 20 Find the percentage change in its area ........ for CDS Exam Preparation

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Multiple Choice Questions

If each side of a square is increased by 20 Find the percentage change in its area ........

Quantitative Aptitude (CDS) Mensuration 2D
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    If each side of a square is increased by 20%,  Find the percentage change in its area.

    50%

    Incorrect Answer

    44%

    Correct Answer

    45%

    Incorrect Answer

    46%

    Incorrect Answer
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    Explanation:

    Let each side of the square be a. Then, area= a2

    New side = 120a/100= 6a/5.

    New area = (6a/5)2= 36a2/25

    Increase in area = (36a2/25 – a2) = 11a2/25.

    Increase % = ((11a2/25)/a2 × 100) = 44%

    By: bhavesh kumar singh
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