For $2021,$ Shinra had the following inventory transactions related to its Mako:

Units $*$ Cost $=$ Total

Beginning Inventory $50$ $$40$ $$2,000$

Purchase: $6/1/2190504,500$

Purchase: $10/15/21150609,000$

Goods Available for Sale $290$ $$15,500$

Ending Inventory $80$

Shinra uses a periodic $($waiting until the year is over$)$ inventory system.

Required:

$1)$ Using FIFO, calculate ending inventory and COGS at December $31,2021.$

$2)$ Using LIFO, calculate ending inventory and COGS at December $31,2021.$

$3)$ Using Weighted Average, calculate ending inventory and COGS at December $31,2021.$