Hi,How did they get the 2 and the 20 from the explanation?I dont understand .Thanks.

72) Earl-Lee Riser-Alarm-Co. issued-$10,000-of-bonds on January 1, 2021. The bonds pay- interest-semiannually. This is a partial-bond-amortization schedule for the bonds.[ 1 Effective Decrease in Outstanding Paymento Casho interest balanced balanced 9,080 10 9 9,089 9 9,098 30 9 9.107 40 0 0 0 400 c 400 c 400 c 400 C 409 C 409 C 409 0 0 0 0 0 0 a og What would be the total interest expense recognized for the bond issue over its full term? A) $16,000.1 B) $16,360.1 C)-$16.920.1 D) $20,000.1 1 Answer:--CT Explanation: ($400-x-2-x 20)+($10,000-$9,080)=-$16,9207