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 $600$ units from beginning inventory, $300$ from the February $10$ purchase, $190$ from the March $13$ purchase, $140$ from the August $21$ purchase, and $315$ from the September $5$ purchase.$)$