a) remain the same
b) decrease by 13.64%
c) decrease by 15%
d) decrease by 30%
Answer: d
Explanation: Let length, breadth and height of the room be 3, 2, 1 unit respectively.
Area of walls = 2(l + b) × h = 2(3 + 2) × 1 = 10 sq. unit.
Now, length, breadth and height of room will become 6, 1 and $$\frac{1}{2}$$ respectively.
Area of walls = $$2\left( {6 + 1} \right) \times \frac{1}{2}$$ = 7 sq. unit.
% decrease in the area of walls = $$\left( {10 – 7} \right) \times \frac{{100}}{{10}}$$ = 30%
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