$\backslash$table$[[$May $1,$Purchased,$380$ units at $$15$ each$],[$May $5,$Purchased,$270$ units at $$17$ each$],[$May $20,$Purchased,$300$ units at $$22$ each$]]$

Sold $800$ units

There was no beginning inventory. Calculate Cost of Goods Sold and Ending Inventory under $($a$)$ FIFO, $($b$)$ LIFO, and $($c$)$ Weighted Average.