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

The firm uses the perpetual inventory system.

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

b$.$ What is the COGS for the sale on $10/24$ using FIFO?

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

d$.$ What is the COGS for the sale on $10/24$ using LIFO?