please do it carefully, because I don't fully understand this problem. thanks for your helping.

also, if you are ble to help me the second question with ending inventory, that'd be great. I appricate it.

Bonita Company uses a periodic inventory system. For April, when the company sold 550 units, the following information is available. Units Unit Cost Total Cost April 1 inventory 300 $19 $5,700 April 15 purchase 410 23 9,430 April 23 purchase 290 25 7,250 1,000 $22,380 Compute the April 30 inventory and the April cost of goods sold using the LIFO method. Ending inventory 9990 Cost of goods sold $ 16890