Answer:
December 31, year 2, second annual payment
Explanation:
The first annual payment included a $20,000 interest (= $250,000 x 8%), therefore the principal was only reduced by $17,258 (= $37,258 - $20,000). Remaining principal = $250,000 - $17,258 = $232,742
The second annual payment included a $18,619 interest (= $232,742 x 8%), therefore the principal was reduced by $18,639.