What is the oxidation state of Fe in Fe3O4? When I calculate it I get 8/3 which is a fraction. I am confused because oxidation state is supposed to be a whole number. Please help ASAP.

What is the oxidation state of Fe in Fe3O4? When I calculate it I get 8/3 which is a fraction. I am confused because oxidation state is supposed to be a whole number. Please help ASAP.