Under the FIFO perpetual inventory system, given the information below, what would be January's Cost of Goods Sold be? Under the LIFO perpetual inventory system, given the information below, what would be January's Ending Inventory value?

please help walk me through this. im very confused but i want to understand. what is the FIFO perpetual inventory system or LIFO perpetual inventory system?

Date 1/1 1/5 Description Beginning Inventory Bought Inventory Sold Inventory Bought Inventory Sold Inventory Units Cost per Unit 150 10.00 75 12.00 130 ?? 100 8.00 60 ?? 1/16 1/20 1/28