On July 1, 2018 a semi-annual $600,000 bond with coupon rate of 10% had a Net book value of $500,000. On Dec 31 2019, the bond was repurchased for $500,000. The Gain on the repurchase was $10,000. The Net Book Value of the bond on Dec 31, 2018 was. 510.000 $490.000 $592.500 $607,500 $507,500 $52.500