An investor company purchased $405,000 of 9% 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 $768,510. Using the effective-interest method, the investor company revised the Available-for-Sale Debt Securities account on December 31, 2020 by the amortized discount/premium of $6,840. At December 31, 2020, the fair value of the investee company bonds was $959,000. What is the amount of unrealized holding gain/loss related to this investment in 2020? (Very important: Just enter the amount. DO NOT put a plus or minus sign in front of the amount.)