FIFO and LIFO costs under perpetual inventory system

The following units of an item were available for sale during the year:

Line Item Description Units and Cost

Beginning inventory $21$ units at $$44$

Sale $18$ units at $$62$

First purchase $15$ units at $$47$

Sale $13$ units at $$62$

Second purchase $10$ units at $$48$

Sale $5$ units at $$63$

The firm uses the perpetual inventory system, and there are $10$ units of the item on hand at the end of the year.

a$.$ What is the total cost of the ending inventory according to FIFO?

b$.$ What is the total cost of the ending inventory according to LIFO?