I need help figuring this out!

Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods

The units of an item available for sale during the year were as follows:

Jan. 1	Inventory	17	units at $24	$408
Aug. 13	Purchase	6	units at $25	150
Nov. 30	Purchase	12	units at $27	324
Available for sale		35	units	$882

There are 21 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using the (a) first-in, first-out (FIFO) method; (b) last-in, first-out (LIFO) method; and (c) weighted average cost method (round per-unit cost to two decimal places and your final answer to the nearest whole dollar).

a.	First-in, first-out (FIFO)	$fill in the blank 1
b.	Last-in, first-out (LIFO)	$fill in the blank 2
c.	Weighted average cost	$fill in the blank 3