Answer:
Retained Earnigns 14,000 debit
Inventory 14,000 credit
Explanation:
It will need to adjust the inventory for the difference. In this case:
171,000 new method - 185,000 old method = 14,000 decrease
As a lower inventory will be faces with a higher cost of good sold the net incoem of the prevous year will also decrease by 14,000.
The net income is "stored" on retained earnings account. Therefore, we must decrease retained earnings as well.
After this adjustment the 2017 books will be like if the average cost mehod was used.