If each edge of a cube is increased by 25%, then the percentage increase in its surface area is?

Question: If each edge of a cube is increased by 25%, then the percentage increase in its surface area is? Solution: Let the original edge = a Then, the surafce area = 6a2 New edge = 125a/100 = 5a/4 New surafce area = 6 × (5a/4)2 = 75a2/8Increase in surface area = (75a2/8 - 6a2) = 27a2/8The percentage increase in its surface area = (27a2 × 1/6a2 × 100)% = 56.25%