Help! I am having a hard time with charting the below information. This involves determining FIFO, LIFO, and Weighted Average. Some break it down but not clearly enough (specifically the cell blocks, which throws off the information on my end) :/ Thanks a bunch! 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 $24 each. 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.) Purchases on December 7 10 units @ $10.00 cost Purchases on December 14 20 units @ $16.00 cost Purchases on December 21 15 units @ $18.00 cost.