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Each edge of a cube is increased by 20% then the percentage increase in surface

Each edge of a cube is increased by 20% then the percentage increase in surface area of the cube is : 

  • Option 1)

    39%

  • Option 2)

    40%    

  • Option 3)

    44%

  • Option 4)

    72.8%

  • Option 5)

    144%

Answers (1)
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Let edge = 100

Surface area = 6\times 100\times 100=60000

New edge = 120

New Surface area = 6\times 120\times 120=86400

Increase % = \left ( \frac{(86400-60000)}{60000} \right )\times 100

\Rightarrow  44%

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