An organic compound weighing 500 mg, produced 220 mg of${\rm{C}}{{\rm{O}}_2}$, on complete combustion. The percentage composition of carbon in the compound is ____%. (nearest integer) (Given molar mass in ${\rm{gmo}}{{\rm{l}}^{-1}}$ of ${\rm{C}}:12,{\rm{O}}:16$)
