Surface area
I will calculate the volume with the bottom box + upper box. 30*8*12 is the dimensions of the bottom box, and 11*(30-9-9)*12 = 2880+1584 = 4464
Sorry, that was volume. The surface area is 30*8*2 + 12*8*2 + 30*12 + 9*12*2 + 11*12*2 + 12*12.
