my answer was 4,140 but it's incorrect. please help to find amount for ending inventory under specific identification.

Flounder Corporation began operations on December 1, 2022. The only inventory transaction in 2022 was the purchase of inventory on December 10,2022 , at a cost of $20 per unit None of this inventory was sold in 2022 . Relevant information for fiscal 2023 is as follows Ending inventory units: During 2023, the following purchases and sales were made: The company uses the periodic inventory method (a1) Determine ending inventoryunder specific identification Ending inventory