Each side of a cube is increased by 20%. The total percentage increase in the surface area of the cube is: (a) 144% (b) 40% (c) 44% (d)
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Answer:
Option(c) is correct
Step-by-step explanation:
Let the side be 100x
then SA=6(100x)²=60000x²
side after 20% increase
=120x
New SA=6(120x)²=6*14400x²=86400x²
Change in SA=86400x²-60000x²
=26400x²
% increase=26400x²/60000x²*100
=264/600*100
=264/6
=44%
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