Hi ! I've honestly spent a long time trying to figure this out, but I keep getting the answer wrong and I'm not sure how I should go about this question. I'm not asking for you to just give me the answer, if you have time to give a little explanation that would be nice so I could understand what I'm doing :) thanks !

http://i4.photobucket.com/albums/y116/walkonrainbows/wiley.jpg

try this:
Fifo - first in first out first example.

7/1 - 7 @ $93
7/6 - sold 3
4 @ $93 remain
7/11 - 4 @ $99
7/14 - sold 3 (@ $93)
7/21 - 3 @ $106
7/26 - sold 5 (1 @ $93, 4 @ $99)

Looks like you have ending inventory of 3 @ $106

Lifo - last in first out

7/1 7@ $93
sold 3 @ $93, remaining 4 @ $93

7/11 - 4 @ $99
7/14 - sold 3 @ $99, remaining 1 @ $99

7/21 - 3 @ $106
7/27 - sold 3@ $106, sold 1 @ $99, sold 1 @ $93-
Inventory 3 @ $99

Average cost

average cost of 14 units is $1365 / 14 = $97.50
3 units left = $292.50