The Oppenheimer Company made the following purchases and sales during September $2018$: Cost per unit Units

$1-$Sep Inventory $-$ beginning balance $10010,000$

$5-$Sep Purchases $9812,000$

$12-$Sep Sales $19,000$

$22-$Sep Purchases $9625,000$

$25-$Sep Sales $27,000$

REQUIRED:

A Compute the ending inventory and the cost of goods sold: company uses:

The periodic inventory system and the FIFO cost flow assumption.

The periodic inventory system and the LIFO cost flow assumption.

The periodic inventory system and the Weighted Average cost flow assumption.

B Which method should they use and WHY?