I saw a pricing spreadsheet on CC a while back. I didn't bookmark it or save it but I'm interested in taking a look now. There was a spot to enter the number of eggs, cups of flour, sugar, etc.
If anyone has that, I would sure appreciate the link because my searches haven't been productive.
I don't know if this is what you were looking for, but here's the link to the pricing matrix. You can enter your info for each cake, and get the price you should charge. You can also go to one of the tabs on the bottom(don't remember which one), and it breaks all of the costs down for you...eggs,flour,butter, etc. Hope this helps!