Answer:
See below
Step-by-step explanation:
1. Corrected amounts for 2020 cost of goods sold
= Cost of goods sold for 2020 - December 31, 2019 ending inventories overstated + December 31, 2020 ending inventories overstated
= $1,322,900 - $106,470 + $36,820
= $1,253,250
2. Correct amounts for December 31, 2020 retained earnings
= Retained earnings December 31, 2020 - December 31, 2020 ending inventories overstated
= 4,854,000 - $36,820
= $4,817,180