Find the area of the rectangle. You can find the area of a rectangle with the following formula:

w = width, and l = length.
Plug in your width and length:

The area of the rectangle is 200 square centimeters.
The area of a square is also given by width * length. Multiply the sides together:

The area of a square is 4x^2.
Because you're cutting away the square from the rectangle, you will subtract the area of the square from the area of the rectangle. The following equation will be your answer:
Here is the formula: b•h/2
Answer:
área is 15 perimeter is B
X=7%
y=12%
x+y=20000
0.07x+0.12y=20000*0.19=3800