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 $26 each Purchases on Decenber? Purchases on becesber 14 Purchases on Deceaber 21 10 units e $12.00 cost 20 units e $18.00 cost 15 units e $20.00 cost of the units sold, 8 are from the December 7 purchase and 7 are from the December 14 purchase. Determine the costs assigned to nding inventory when costs are assigned based on specific identification