A friend wants me to do a sheet cake to serve 40-45 people...she wants it Hannah Montana, but I am only going to do the cake iced smooth with borders and some scrollwork on top, then she is going to add some plastic decorations she is ordering online.

I have been googling to see what size cake to make, but every site disagrees! What size would you make? What would you charge? (just a simple vanilla cake, not torted and buttercream frosting)

Here's what I charge: 3/4 Sheet (27x13) Serves 50-60 $70.00

I don't know about pricing for sheet cakes but Indydebi explains serving size for sheet cakes really well on this thread:

http://www.cakecentral.com/cake-decorating-ftopict-625835-serving.html

and here's a link to Wilton's guide (Party serving sizes):

http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm

Here's a post about pricing for sheet cakes (I didn't read it all the way though so I don't know if it will help).

http://www.cakecentral.com/modules.php?name=Forums&file=viewtopic&t=625687&postdays=0&postorder=asc&highlight=serving&&start=0