Required information Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Also, on December 15, Monson sells 30 units for $50 each. Required: Monson selis 30 units for $50 each on December 15 . Of the units sold, 16 are from the December 7 purchase and 14 are from the December 14 purchase Monson uses a perpetual mventory system. Determine the costs assigned to the December 31 ending nventory when costs are assigned based on specific identification