Answer:
1. Adjusting to Average Cost
DR Retained Earnings ........................................................$5,700
CR Inventory .......................................................................................$5,700
Working
Inventory = FIFO Ending Inventory 2020 - FIFO Ending Inventory 2019
= 85,800 - 80,100
= $5,700
2. The beginning inventory for 2020 will be lower by;
= 2019 FIFO Inventory - 2019 Average Cost inventory
= 80,100 - 71,700
= $8,400
The ending inventory will be lower by;
= 2020 FIFO Inventory - 2020 Average Cost inventory
= 85,800 - 80,100
= $5,700
Cost of Goods sold = Beginning inventory + purchases - ending inventory
= -8,400 - (-5,700)
= $2,700
Cost of Goods sold in 2020 income statement will be $2,700 lower.