Each side of a cube is increased by 50%. Then the surface area of the cube increases by
a) 50%
b) 100%
c) 125%
d) 150%
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Answer:
c) 125%
Let, 2a be the side of cube
then, new side is 3a...as 50% of 2a is a
Old surface area =(6)(2a)²
=24a²
New surface area=6(3a)²=54a²
Area becomes=(54a²÷24a²)×100
=(225%)
Now, Increase in percentage is
225–100=125
c)125%
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