As you can see in the picture above, there are six faces of a rectangular prism; two are formed with dimensions width and height, two are formed by the dimensions length and width, and two are formed by the dimensions length and height. So, if you know the length, width, and height of the rectangular prism, then the formula for the surface area is
=(2⋅ℎ⋅ℎ)+(2⋅ℎ⋅ℎℎ)+(2⋅ℎ⋅ℎℎ)
Add 11 to each side. X = 90+11
X = 101
That number is closer to 700,000 than 185,505 for example, because it is a bigger number. Hope that makes sense.
If you used $8, then you must add 8 to 32 which equals $40