i need help solving the green circle area. can you please explain how to get those numbers?

Required information [The following information applies to the questions displayed below) Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases Monson uses a perpetual inventory system. Also, on December 15, Monson sells 25 units for $25 each Purchases on December 7 15 units $10.00 cost Purchases on December 14 30 units $15.00 cost Purchases on December 21 25 units $18.00 cost of the units sold, 12 are from the December 7 purchase and 13 are from the December 14 purchase Determine the costs assigned to ending Inventory when costs are assigned based on specific identification Specification Goods Available for sale COSTOSO of Cost Cost of Goog Cost De units Available units per for Sale sold Com Gool Sold Ending Inventory orunts Cost Ending In ending per ventory Inventory und 1 0 150 Purchase Decor De 14 December 21 To 15 10.00 15.00 25000 10 OOO 150 450 150 100 10.00 O 15.00 a 150 10.00 15.00 1800 00 @ 450 270 70 0 $ 0