Inventory accounting method

Which one is used for computing end product quality and cost? FIFO (first in, first out), FILO (first in, last out), or the average cost method? Seeking to stockpile so this will help me determine whether or not to stockpile enough for an entire cycle.

Many thanks for your time and consideration,
Marshal Ney, CEO Ducal Enterprises GR

Product qualities are averaged out.

Average cost method

Marshal you took accounting classes in college didnt you, i did also, 3 classes to be exact.

School was a long time ago. Unless you count the armed services. Last civilian school attended was in '67.