someone please help with step by step for all four of them

[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 15 units for $32 each. Determine the costs assigned to the December 31 ending inventory based on the FIFO method. Required: etermine the costs assigned to ending inventory wizisis are assigned based on the LiFO method unit costs to 2 decimal piaces.) Of the units sold, 8 are from the December 7 purchase and 7 are from the December 14 purchase. Determine the costs assigned to ending inventory when costs are assigned based on specific identification