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 $36 each. Purchases on Decenber 710 units $22.00 cost Purchases on December 1420 unite e $28.00 cost Purchases on December 2115 units e $30.00 cont QS 5-11 (Algo) Perpetual: Assigning costs with FIFO LO P1 Required: Determine the costs assigned to the December 31 ending inventory based on the FiFO method