The area of the floor is 21 feet * 27 feet = 567 square feet. Since there are 9 square feet in a square yard, the area of the floor in square yards is 567 square feet / 9 = 63 square yards. At a cost of $18.25 per square yard, it will cost 63 square yards * $18.25 per square yard = $1,149.75 to carpet the floor. Is there anything else you would like to know?