Mathematical calculation of the surface are of a hut's walls and internal ceiling

Final deliverable:- You are supposed to find out AW, the surface are of plywood required for the walls of the hut in metres squared. Please refer to the attached document for more details. The assignment is very short and I would need the step by step calculations to be typed in and finished within 1 -2 hours. You need to type them in a word document and send them back to me. People who can finish within the deadline and budget will be awarded this project.