On January 1 of the current year, Barton Corporation issued 6% bonds with a face value of $87,000. The bonds are sold for $82,650. The bonds pay interest semiannually on June 30 and December 31, and the maturity date is December 31, five years from now. Barton records straight-line amortization of the bond discount. The bond interest expense for the year ended December 31 is Oa. $435 Ob. $6,525 Oc. $2,610 Od. $6,090