ABC, Inc. uses the periodic inventory system, and had the following purchases and sales of inventory for the month of March:

$\backslash$table$[[$Mar$.1,$Beginning Inventory,$100$ units @ $$50],[$Mar$.5,$Purchased,$400$ units @ $$55],[$Mar$.9,$Sales,$420$ units @ $$85],[$Mar$.18,$Purchased,$120$ units @ $$60],[$Mar$.25,$Purchased,$200$ units @ $$62],[$Mar$.29,$Sales,$160$ units @ $$95]]$

Calculate the cost of ending inventory using $($a$)$ FIFO; $($b$)$ LIFO; $($c$)$ Weighted Average