In carbonate ion Formal charge on doubly bonded oxygen is X and formal charge on Carbon atom is Y. Value of X and Y are respectively

In carbonate ion doubly bonded Oxygen is having 2 lone pair electrons and 2 bond pair electrons.Formal charge  = 6-4-42=6-4-2=0Around Carbon atom 4 bonds are present.Formal charge  =  4-0-82=0