If each of the dimensions of a rectangle is increased by 100%, then the area is increased by

If the radius of the circle is increased by 100%, then the area is increased by

If the length of a rectangle is increased by 1/3rd and the width is decreased by 1/3rd, then the area of the rectangle is decreased by the fraction

The length of a given rectangle is increased by 20% and the breadth is decreased by 20%, then the area

If the length of a rectangle is increased by 200/3 %, then by what percent should the width of the rectangle be decreased in order to maintain the same area ?

If radius of a circle is increased by 10%, percentage increase in area is