If the side of a square is increased by 25%, then how much percent does its area get increased?

Let area 100 m² Then, side = 10 m New side = 125 % of 10 = (125/100) x 10 = 12.5 m New area = 12.5 x 12.5 m² =(12.5)² sq. m∴ Increase in area = (12.5)² - (10)² m² = 22.5 x 2.5 m² =56.25 m² % Increase = 56.25 %