Answer:
12,000. I made the assumption that the windows cover exactly 1/4 of the building.
Explanation:
Length = 50
Width = 30
Height = 300
(Becuase it is always length, width and height)
To find surface area you do length x height x 2. (Becuase there are two walls with the length)
And another is width x height x 2 (Becuase there are two walls with the width.
(50 x 300) x 2 = 30000
(30 x 300) x 2 = 18000
Then add those two together getting 48,000. You have to dived that by 4 to get quarters. Which is 12,000. So 1/4 of the building is 12,000.