Answer :
we have to find the area first
12 x 18=216 square feet
we do 216* $ 1.39= $ 300.24
12 x 18=216 square feet
we do 216* $ 1.39= $ 300.24
You just first do 12×18 and you will get 216. Then you will multiply 216 ×1.39 and you will get the answer 300.24.