Question

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%​

Answer 1

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%