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the answers are correct but I want to know the reason

On January 1, 2018, Nurses Credit Union (NCU) issued 8%. 20-year bonds payable with face value of $800,000. These bonds pay interest on June 30 and December 31. The issue price of the bonds is 108. Journalize the following bond transactions: (Click the icon to view the bond transactions.) (Assume bonds payable are amortized using the straight-line amortization method. Record debits first, then credits. Select explanations on the last line of the journal entry. Round your answers to the nearest whole dollar.) Debit Credit a. Journalize the issuance of the bonds on January 1, 2018 Date Accounts and Explanation 2018 Jan. 1 Cash Premium on Bonds Payable Bonds Payable 848,000 48,000 800.000 Issued bonds at a premium Debit Credit b. Journalize the payment of interest and amortization on June 30, 2018 Date Accounts and Explanation 2018 Jun 30 Interest Expense Premium on Bonds Payable Cash 30.800 1.2009 32,000 Paid semiannual interest and amortized premium. Credit c. Journalize the payment of interest and amortization on December 31, 2018 Date Accounts and Explanation Debit 2018 Dec 31 Interest Expense 30.800 Premium on Bonds Payable 1.200 Cash 32.000 Paid semiannual interest and amortized premium d. Journalize the retirement of the bond at maturity on December 31, 2037, assuming the last interest payment has already been recorded. Date Accounts and Explanation Debit Credit 2037 Dec 31 Bonds Payable 800,000 Cash 800.000 Retired bonds payable at maturity Move your pointer over or tap on the cells with red arrows to see incorrect answers