Required information

Use the following information for the Exercises $3-7$ below. $($Algo$)$

$[$The following information applies to the questions displayed below.$]$

Laker Company reported the following January purchases and sales data for its only product. For specific identification, ending inventory consists of $280$ units from the January $30$ purchase, $5$ units from the January $20$ purchase, and $15$ units from beginning inventory.