FIFO and LIFO costs under perpetual inventory system

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

Beginning inventory

Sale

First purchase

Sale

Second purchase

Sale

$37$ units at $$46$

$29$ units at $$69$

$19$ units at $$48$

$5$ units at $$69$

$29$ units at $$49$

$28$ units at $$71$

The firm uses the perpetual inventory system, and there are $23$ 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?