"Carpet stain protector costs $0.65 per square yard to apply. How much will it cost to apply the protectant to a 16-foot × 18-foot carpet?"
multiply 16 feet by 18 feet to determine the number of square feet, 288. Then divide 288 by 9 to convert square feet to square yards (1 square yard = 3 feet × 3 feet = 9 square feet). Multiply the quotient, 32 square yards, by the cost of protection per square yard, $0.65, to get the correct answer, $20.80.