[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 $37 each. Purchanes on Decenber ? 10 units 9$23,00 cont Purchases on Dectnber 14,20 units \& $29.00 coat Purchanen on Decenber 2115 units $31.00 eost Determine the costs assigned to ending inventory when costs are assigned based on the weighted average method. (Round your per unit costs to 2 decimal places.)