Please provide the solution and the explanation on how to calculate the interest expense

Pr. 13-129 Prepare journal entries to record the following transactions relating to long-term bonds of Kirby, Inc. (Show computations.) (a) On June 1, 2024, Kirby, Inc. issued $8,000,000, 6% bonds for $7,841,000, which includes accrued interest. Interest is payable semiannually on February 1 and August 1 with the bonds maturing on February 1, 2030. The bonds are callable at 102. (b) On August 1, 2024, Kirby paid interest on the bonds and recorded amortization. Kirby uses straight-line amortization. (c) On February 1, 2026, Kirby paid interest and recorded amortization on all of the bonds, and purchased $5,000,000 of the bonds at the call price. Assume that a reversing entry was made on January 1, 2026