Song Hye Kyo (SHK) Company had 20,500 units on November 30, 2019, based on physical count of goods on that date. The following items have not yet been recorded as purchases and sales as of November 30.

No. Transaction Terms Number of units

1 Purchase FOB Shipping point 500

2 Purchase FOB Destination 350

3 Purchase FOB Buyer 550

4 Sale FOB Shipping point 500

5 Sale FOB Destination 750

6 Sale FOB Buyer 650

All items were shipped by the seller November 28, 2019 and received by buyer December 13, 2019.

How many units should be considered as inventory at the end of November 2019?