im getting Dec 15 inventory balance wrong and i cant figure out why? its not 10 or 18

Purchases Purchase on December 14 Per on December 31 2 units 32.00 QS 5-10 Perpetual: Assigning costs with FIFO LO P1 Required: Monson uses a perpetual inventory system. Determine the costs assigned to the December 31 ending inventory based on the FIFO method Pertal FIFO Costot Goods Bold Bot Cost Per Cost of Good Units Unit Sold of cooter Goots Purchased 58.00 - 539400 of tolas 18.00 - 3400 ta December December 18 $15.00 5 27.00 - $ 4.00 532400 5640 $1.158.00 ats 27.00 - $16.00 100 5 27.00 532400 December 15 tale 5. 18.00 100 $ 27.00 $ 270.00 559400 December 20a $ 32.00 - $896.00 220 $ 27.00 20ets 30.00) 5. 96.00 51.490.00 $ 50400 Total on 4 5 6 7