Question

If each edge of a cube is increased by 50%, find the percentage increase in its surface area

Answer 1

let side of cube be x
so surface area is equal to 6x*x

if side are increased by 50%
then new side will be 3x/2
so new surface area Is equals to 27*x*x/2
so increase percentage equals to 125%

Answer 2

side a
increase side a +0.5a= 1.5A
surface area 6 * 1.5a*1.5a= 13.5a square
normal s a 6 *a*a=6a square
percentage increase 13.5-6/6*100=125%