Area = length X width A = L(12 ft) x W(9 ft) but since the cost of carpet is given in square yards not square feet we need to convert A = (12 ft)(1 yd/3 ft) x (9 ft)(1 yd/3 ft) 1 yard = 3 feet so 1 foot = 1/3 yard A = 4 yd x 3 yd divide by 3 ft which cancels the original ft and leaves yd's A = 12 square yards Cost = Area x price per yard Cost = 12 sq yd X $35.00/ sq yd multiply and the sq yd's cancel leaving just cost in dollars Cost = $420.00
Multiply the total number of square feet by the cost per square foot of the carpet. If padding isn't included, multiply the cost of the padding by the total number of square feet, and then add the result to the total cost per square foot of the carpet.