Beginning inventory 15,000 with unit cost of $30; purchased March 21 12,000 units with unit cost of $31, purchased June 21 5,000 with unit cost of $32; purchased September 21 2,000 units with unit cost of $33; purchased; on November 21 10,500 units with unit cost of $35. On December 31 there are 13,500 units in ending inventory.

Using a periodic inventory system:

1. What is the cost of the ending inventory under FIFO?

2. What is the cost of ending inventory under LIFO?

3. What is cost of ending inventory under average-cost?

4. What is cost of goods sold under FIFO?

5. What is cost of goods sold under LIFO?

6. What is cost of goods sold under weighted average?

7. What would be the difference due to the different inventory methods to Net Income before taxes between LIFO and FIFO? Please provide a specific number.