Help, i've got a wedding cake to make next year, 150 to feed, all sponge, albeit different flavours, decorated in sugarpaste, i'm thinking, 14, 12, and a 10inch round, i have no idea what to charge, and she wants a smallish fruit cake in royal icing to please mum i think, i need so much help as never made a cake that size before ( the 14inch terrifies me) TIA.