Answer :

TSO
180 square feet

So 

3 feet = 1 yard
9 square feet = 1 square yard

180/9 = 20 square yards

20 x 15 = $300

which is your final answer (:
Geekhawk
Ok, so I am changing this answer to the correct one based on what you said

Area (Square) = length times width 

1yard^2⇒3feet^2⇒9^2

Then take 9 and divide 180 sq feet from it

180 ÷ 9  = 20 sq yards

Then multiply 20 by $15

20×$15=$300

Answer:

$300