Q. Each edge of a cube is increased by 40%. The percentage increase in the surface area is?

Let the edge of cube = a

Surface area = 6a²

New edge = 140a / 100 = 1.4a

New Surface Area = 6*(1.4a)² = 6*1.96a² = 11.76a²

Increase in surface area = (11.76 - 6)a² / 6a² * 100

=> (5.76 / 6) * 100

= 0.96 * 100

= 96%

Ans: 96%

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