An investor company purchased $701,000 of 5% bonds from the investee company on January 1, 2020, with interest payable on December 31. The bonds were classified as Available-for-Sale. The bonds sold for $510,210. Using the effective-interest method, the investor company revised the Available-for-Sale Debt Securities account on December 31, 2020 and December 31, 2021 by the amortized discount/premium of $6,410. and $8,120, respectively. At December 31, 2020, the fair value of the investee company bonds was $401,000. At December 31, 2021, the fair value of the investee company bonds was $674,000. What is the amount of unrealized holding gain/loss related to this investment in 2021? (Very important: Just enter the amount. DO NOT put a plus or minus sign in front of the amount.)