A rectangular-shaped carpet remnant that measures \(x\) feet by \(y\) feet is priced at \(\$50.\) What is the cost of the carpet, in dollars per square yard? (9 square feet = 1 square yard).
A. \(50xy\)
B. \(450xy\)
C. \(\dfrac{xy}9\)
D. \(\dfrac{xy}{50}\)
E. \(\dfrac{450}{xy}\)
Answer: E
Source: GMAT Prep