need to know what a 10 x10x2 square cake pan feeds double layer
http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm
the size in question serves 50 - the chart above is good reference for servings and different shapes/sizes
*ALWAYS* use the Wilton chart - especially when informing customer in regards to pricing.
Yes, there are other charts out there but usually they give different sized servings. Why should YOU subsidize the customer's pocket?
In/for almost any product there is a listing of how many servings are in a container/recipe. And you can't argue with them about it - you are still going to pay the price for X # of servings
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