If length, breadth and height of cuboid are increased by 20 %,what is the change in the total surface area of the cuboid?

33%

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40 %

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44 %

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54%

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Solution

The correct option is C 44 %
Let l, b, h be the original dimensions

New dimensions = (1.2 l), (1.2 b),(1.2 h)

New total surface area = 2(lb + bh + hl) = 1.44 x 2(lb+bh+lh)

$\Rightarrow$ 44 % increase in the total surface area.

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