If sides of a square is increased by 33%, then find the percentage change in its area.

66.67% 66% 77.77% 76.89%

76.89%

Total increased % in area = r% + r% + \(\frac{r × r}{100}\) %                                      = 33% + 33% + \(\frac{33× 33}{100}\)%                                      =66% + 10.89% ⇒ 76.89%