Q

# 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%

Views

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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