Please help due in a couple of hours .... Please help fill in the blanks thank you

Perpetual inventory using ufo Beginaing inventory, purchases, and sales data for prepald celi phones for December are as follows: Inventory Dec. 13,500 units at $33 Sales Dec. 12 2,450 units 142,100 units 31 1,050 units a. Assuming that the perpetual inventory system is used, frosting by the Lifo method, determine the cost of goods sold for each sale and the inventory balance ahter each sale, presenting the data in the form illustrated in Exhibit 4. Under LIFO, if units are in inwentory at two different costs, enter the units with the HiCHER unit cost first in the Cost of Goods Sold Unit Cost column and LOWEg unit cost first in the Inventory Unit Cost column. a. Assuming that the perpetual inventory system is used, costing by the Lifo method, determine the cost of goods sold for esch sale and the inventory balance after each sale, presenting the data in the form illustrated in Exhibit 4 . Under LIFO, it units are in inventory at two different costs, enter the units with the HichER unit cost first in the Cost of Goods Sald Unit Cost column and LOWER unit cost first in the Inventory Unit Cost column