Surface Area = 358ft²
First find the area for each shape on the box.
Base x Height
Bottom rectangle = 9ft x 4ft = 36ft
There are two of the same rectangle (top and bottom)
So 36ft + 36ft = 72ft
Side rectangles = 4ft x 11ft = 44ft
There are two side rectangles so,
44ft + 44ft = 88ft
Front and back facing rectangles,
9 x 11 = 99ft
99 + 99 = 198ft
Add them all together:
198 + 88 + 72 = 358ft²
Surface Area = 358ft²