Why is discount on bonds payable a contra liability and why does a contra liability end up increasing liabilities? Whats the relation to interest expense and this contra liability account ?

Bonds issurd ata D BiP te The asset amunt w bc samc for uohiti t r. Ih conna i aiiry aunt uui he amamd over thc ifc of thc bund as an adjument to Intvn cxtcnic A ds cuum amoriza Bip Cash 5 ycav 5. bund issucd for $ 475.00 pcr bond. Mavcet The bundl is cos ting the cumpony mbre than jut thc. tapun Inrott hs cach cupon is puid se helow thar's un 1 /000 face value CasH