FIFO and LIFO costs under perpetual inventory system

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

Beginning inventory $,23$ units at $$42$

Sale $,20$ units at $$67$

First purchase $,22$ units at $$43$

Sale $,17$ units at $$67$

Second purchase $,17$ units at $$44$

Sale $,13$ units at $$68$

The firm uses the perpetual inventory system, and there are $12$ 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?

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