Answer :

valerieulbrich

Answer:

B

Step-by-step explanation:

2 walls are 30 x 9 and 2 walls are 20 x 9 and there are 4 units

30 x 9 = 270, 20 x 9 = 180

4(2)(270) + 4(2)(180) = 3600, so the answer is B

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