How many units remain in ending inventory?

LaPlante Inc.
Analysis of Inventory
January Purchase and Sale Activity
Valuing Ending Inventory
Periodic Inventory
FIFO Method
	Date	Transaction Type	Units	Unit Cost
	1-Jan	Opening Inventory	100	$ 1
	7-Jan	Purchase		10	$ 2
	9-Jan	Sale		80
	21-Jan	Purchase		20	$ 3
	24-Jan	Sale		40
1	How many units remain in ending inventory?
2	What is the FIFO Unit Price(s) to be used in valuing Ending Inventory?
3	What is the FIFO value of total Ending Inventory?