Question: discount on bonds payable has not been amortized for any part of 2014;

Question: discount on bonds payable has not been amortized for any part of 2014; the bonds are dated March 1 2008 and mature on March 1 2018Bands payable275000cr.Discount on bonds payable6400dr.I know the journal entries would beinterest expense dr.Discount on bonds payable cr.can you please help me understand how to calculate this?