please explain FIFO, Weighted average cost, specific identification(--units sold consist of 500 units from beginning inventory and 100 units from the march 13 purchase) compared each other.

ex) 1. FIFO

2. weighted average cost

3. specific identification

As a result

Marlow Company uses a perpetual inventory system. It entered into the following calendar year 2011 purchases and sales transactions. Date Activities Units Acquired at Cost Units Sold at Retail 600 units @ $44/unit 200 units @ $40/unit 100 units @ $20/unit Jan. Feb. 10 Mar. 13 Mar. 15 Aug 21 Sept. 5 Sept. 10 400 units @ $75/unit Beginning inventory ......... Purchase.... Purchase............... Sales ............. Purchase ......... Purchase...... Sales ............ Totals .............. 160 units @ $60/unit 280 units @ $48/unit 200 units @ $75/unit 600 units 1.340 units Required Analysis Component 5. If the company's manager earns a bonus based on a percent of gross profit, which method of inventory costing will the manager likely prefer