Please Help! Perpetual inventory using FIFO

Perpetual inventory using FIFO Beginning inventory, purchases, and sales data for prepaid cell phones for December are as follows: FIFO Method Prepaid Cell Phones Cost of Cost of Cost of Purchases Purchases Purchases Goods Sold Goods Sold Goods Sold Inventory Inventory Inventory Date Quantity Unit Cost Total Cost Quantity Unit Cost Total Cost Quantity Unit Cost Total Cost Dec. 1 Dec. 10 Dec. 12 Dec. 14 Dec. 20 Dec. 31 Dec. 31 Balances