How did we calculate NRV and LCNRV ?

LCNRV Instructions: At what amount should the four desks appear in the company's December 31, 2019, inventory, assuming that the company has adopted a lower-of-FIFO-cost-or-net realizable value approach for valuation of inventories on an individual-item basis? Finished Desks 2019 Catalog selling price FIFO cost per inventory list 12/31/19 Estimated cost to 450 480 900 1,050 960 200 500 540 900 1,200 470 450830 110 260 complete and sell 2020 catalog selling price eing price50 Net Realizable Value Lower-of-Cost-or-NRV odo 9-15 LO 1 LEARNING OBJECTIVE 2 Identify other inventory valuation issues Valuation Bases