I'm getting C, is this correct?

Kind of confused that $800 is remaining from the original $500 at retail, if you can please explain that.

Amber, Ltd., uses the LIFO retail inventory method. Certain information is reported below. What is the cost of ending inventorv? 9. Retail $ 500 600 4,200 400 4,300 Cost 300 Beginning inventory Net markups Sales Net markdowns Purchases 3,150 a. $510 b. $492 c. $480 d. $560