IG$-11$ Inc. uses the conventional retail inventory method to account for inventory. The following information relates to current year's operations. Determine the company's ending inventory value $($at cost$)(5$ pts$.)$ and COGS for the year $(4$ pts$.).$

$\backslash$table$[[,$Cost,Retail$],[$Beginning inventory and purchases,$313,500,540,000],[$Net markups,$30,000,],[$Net Markdowns,$20,000,],[$Net sales,$480,000,]]$