4. LIFO, FIFO, Weighted Average are cost-flow assumptions used to calculate COGS. Does the method use the oldest, newest, or average cost to value COGS? Does the method use the oldest, newest, or average cost to value Ending Inventory on the BS? 5. Given a series of facts, calculate ending inventory using the LIFO, FIFO, or weighted average methods. 6. Given a series of facts, calculate COGS using the LIFO, FIFO, or weighted average methods.