E$8.19($LO $3,4)($Alternative Inventory Methods$-$Comprehensive$)$ Tori Amos Corporation began operations on December $1,2019.$ The only inventory transaction in $2019$ was the purchase of inventory on December $10,2019,$ at a cost of $$20$ per unit. None of this inventory was sold in $2019.$ Relevant information is as follows.

Ending inventory units

December $31,2019$

$100$

December $31,2020,$ by purchase date

December $2,2020,100$

July $20,2020,50150$

During the year, the following purchases and sales were made.

$\backslash$table$[[$Purchases$],[$March $15,300$ units at $$24,,],[$July $20,300$ units at $25,,],[$September $4,200$ units at$,28,],[$December $2,100$ units at$,30,]]$

$\backslash$table$[[$Sales$],[$April $10,200],[$August $20,300],[$November $18,150],[$December $12,200]]$

The company uses the periodic inventory method.

Instructions

a$.$ Determine ending inventory under $(1)$ specific identification, $(2)$ FIFO, $(3)$ LIFO, and $(4)$ average$-$cost$.$

b$.$ Determine ending inventory using dollar$-$value LIFO. Assume that the December $2,2020,$ purchase cost is the current cost of inventory. $($H$$t: The beginning inventory is the base layer priced at $$20$ per unit.$)$