Source: De Jesus, A Closer Look on Cost Accounting, 2019, Chapter 3, Problem 16 The inventory stock card of Beth Corporation on January 2021 is as follows: Purchase Price Purchase Units Sold Units Balance Jan 01 P100 10,000 10,000 Jan 15 5,000 5,000 Jan 18 110 15,000 20,000 Jan 20 100 500 20,500 Jan 30 15,500 5,000 Each unit is sold at P150. Required: Compute for the cost of goods sold, ending inventories and the gross profit using (a) Moving average method, (b) simple average method, and (c) FIFO method