The breadth of a rectangle is that of its length. The perimeter of the rectangle is 200 cm. Express its breadth as a percent of its perimeter.

%

The breadth of a rectangle is that of its length. So,

Set the breadth as 2 units and the length as 3 units.

Then, (2 units + 3 units) × 2 = 200

5 units = 200 ÷ 2 = 100

1 unit = 100 ÷ 5 = 20

Then, breadth = 2 units = 2 × 20 = 40

Thus, 40 ÷ 200 = 0.2 = 20%