Let each side of the square be a unit. Length of the rectangle =a+
30
100
a =1.3a Breadth of the rectangle =a+
20
100
a=1.2a Increase in the area =1.3a×1.2a−a2=1.56a2−a2 =0.56a2 Therefore, the area of the resulting rectangle exceeds the area of the square by 56%. Trick: The resulting area is increased by =(30+20+