A rectangular-shaped carpet remnant that measures x feet by y feet is priced at $80. What is the cost of the carpet, in dollars per square yard? (9 square feet = 1 square yard)  Choose the correct choice
A) 80xy B) 720xy C) xy/9 D) xy/80 E) 720/(xy)
xy sq ft = $80   1 sq ft = $80/xy   multiplying by 9 on both side   9 sq ft = $720/xy   or 1 sq yard = $720/xy   Hence 720/(xy).
<result>E</result>
A rectangular-shaped carpet remnant that measures x feet by y feet is priced at $80. What is the cost of the carpet, in dollars per square yard? (9 square feet = 1 square yard)