Gillis Co. reported the following January purchases and sales data for its product:

Date	Activity	Units	Cost
1/1	Beginning Inventory	140	$6
1/10	Sales	100
1/20	Purchases	60	$5
1/25	Sales	80
1/30	Purchases	180	$4.50

The company uses a perpetual inventory system. Determine the costs assigned to ending inventory and cost of goods using the following methods:

a. FIFO

b. LIFO