Please help with this exercise I dont undestand how to calculate it .

The Coral Company issues $10,000,000, 7.8%, 20-year bonds to yield 8% on January 1, 2017 Interest is paid on June so and December 31. The proceeds from the bonds are $9,802,072. Using straight-line amortization, the carrying value on the bonds on December 31, 2020 is A. $9,841,658 B. $9,970,311 Randle Paushia 76 C. $9,816,916 D. $9,835,115 Prohlom