[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 $30 each. \begin{tabular}{l|l|l} Purchasea on Deceaber 7 & 10 units 8$16.00 cont \\ Purchasen on December 14 & 20 unity $22.00 cont \\ Parchasea on December 21 & 15 units 8$24.00 cont \end{tabular} Determine the costs assigned to ending inventory when costs are assigned based on the weighted average method, (Round your per anit costs to 2 decimal places.)