Pequired Information Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Also, on December 15, Monson sells 23 units for $30 each. Required: Monson sells 23 units for $30 each on December 15. Monson uses a perpetual inventory system. Determine the costs assigned to the December 31 ending inventory when costs are assigned based on LiFo