Beginning Inventory Jan. $1200$ $$10$

Purchases: Feb. $1150014$

May $1840017$

Oct. $2310018$

Sales: March $1400$

July $1380$

Calculate the value of ending inventory and cost of goods sold using the perpetual method and $($a$)$ first$-$in$,$ first$-$out, $($b$)$ last$-$in$,$ first$-$out, and $($c$)$ the weighted$-$average cost methods