Montoure Company uses a perpetual inventory system. It entered into the following calendar$-$year purchases and sales transactions.

Required:

Compute cost of goods available for sale and the number of units available for sale.

Compute the number of units in ending inventory. $3.)$ Compute the cost assigned to ending inventory using $($a$)$ FIFO, $($b$)$ LIFO, $($c$)$ weighted average, and $($d$)$ specific identification. $($For specific identification, units sold consist of $620$ units from beginning inventory, $210$ from the February $10$ purchase, $120$ from the March $13$ purchase, $140$ from the August $21$ purchase, and $390$ from the September $5$ purchase.$)$