Excalibur Company uses the perpetual inventory method. Excalibur Company has the following data available for the month of January:

Date	Transaction	Units	Unit Cost
Jan. 1	Beginning inventory	200	$1.00
Jan. 9	Purchase	300	$1.10
Jan. 10	Sale	400
Jan. 15	Purchase	400	$1.16
Jan. 18	Sale	300
Jan. 24	Purchase	100	$1.26

What is the Cost of Goods Sold for the month of January using LIFO?

The answer is $778. I want to know how to calculate.