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 $7,500. The discount rate on the bond was: e 15% 12.5% 6.25% 7.5% 14%