If the length of a rectangle is increased by 30% and its breath is decreased by 40%, then find the percentage of change in its area.

22% decrease

+30% = \(\frac{13}{10}\)

-40% = \(\frac{3}{5}\)

change in length =   10--------13

change in width=     5---------3

                    —————————————

Total effect:            50--------39

change in area = \(\frac{11}{50}\) × 100 = 22% decrease