1.

The edge of a cube is increased by `100%` , then the lateral surface area of the cube is increased by _______`%`

Answer» Correct Answer - 3
Let the edge of the cube be a units.
Lateral surface area of the cube `=4a^2` sq.units.
If edge of the cube is increased by `100%` ,then new edge `=2a`.
The lateral surface area of the new cube
`=4(2a)^2=16a^2` sq.units.
Increase in area `=16a^2-4a^2=12a^2`
`%` increase in area `=(12a^2xx100%)/(4a^2)=300%`.


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