need FIFO, LIFO and mental method

Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method. Answar is comalate but not entiralu rerrart. 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 $35 each. \begin{tabular}{ll} Purchases on December 7 & 10 units $21.00 cost \\ Purchases on December 14 & 20 units $27.00 cost \\ Purchases on December 21 & 15 units $29.00 cost \end{tabular} Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method. Answar is comalate but not entiralu rerrart. 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 $35 each. \begin{tabular}{ll} Purchases on December 7 & 10 units $21.00 cost \\ Purchases on December 14 & 20 units $27.00 cost \\ Purchases on December 21 & 15 units $29.00 cost \end{tabular}