Question

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

• A. 20 %
• B. 40 %
• C. 44 %
• D. 54%

Answer 1

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.