HELP ASAP

The ACC $122$ Company shows the following data related to an item of inventory. SHOW ALL COMPUTATIONS FOR CREDIT.

Inventory, January $1102$ units @ $$15$

Purchases, January $9300$ units @ $$20$

Purchases, January $1970$ units @ $$25$

Ending Inventory, January $31105$ units

REQUIRED:

a$.$ Using the periodic system, what value should be assigned to the ending inventory AND cost of goods sold using FIFO?

b$.$ Using the periodic system, what value should be assigned to the ending inventory AND cost of goods sold using LIFO?