designing an RC plane from foam.

we are doing a project about building and designing an RC plan from foam.
the wing is MH 112 airfoil with dimentions of (chord is10.5 in and span is 60 in and hight 1.2 in) in top of the plane
and two battery wight 200g inside the wings
the fuselage is contain a four pice of wood as supporters (7.5 in by 7.5 in and thiknees of 1/5 in and deep 3/4 in) with 5 fiperglass rods 2/3 in going through it. nose is wight 200 g and taill 150g
I want you to give the center of gravity for the plane with the equations for it please.
there is a pic of the plane attached.