Total area is 13/2 * 13/2 = 169/4 (42.25).
With border, 5.5 x 5.5 meters since its 1 meter wide.
11/2 * 11/2 = 121/4 (30.25);
Thus, area of border is: total - area with border
169/4 - 121/4 = 12 square meters
2.) 12 * 6.5 = $78 (total cost of carpet if 1 square meter costs $6.50).
Try to draw a picture. As you progress through Mathematics, pictures become crucial later on.