Well, not the customer but the caterer who is a friend of the customer. Customer orders cake for 60 asks for a specific design, I was told that this would be a part of a dinner. I did a 10x15, 2 layer. Caterer calls and tells me that she used to do cakes and there is no way to get more than 30 servings from the cake. I am upset mostly because she was rude but I offered to make more cake and deliver it to her (out of town) since my customer is not in town today. I was trying to be gracious but she really ticked me off. Even if I made a mistake we are both professionals and I don't appreciate her tone at all.
Anyway, I am making a 10" 2 layer to supplement. I am missing church tomorrow to deliver it. Will this be enough? I am a new business and don't need the bad word of mouth even though she will probably blast me regardless. I just want to make sure my customer is happy, that's my main priority. So, just looking for some feedback here on the servings and how I handled it. Thanks.
Seems like caterer needs some Cake Education 101. You are extremely gracious to make extra cake AND deliver. Definantly let her know that you are doing this as a courtesy since there was a "mis-understanding" regarding the number of serving sizes. Let her know that the original cake allows for at least 70 servings if cut correctly (1x2" slices) and that is the correct way to cut a double layer cake. If she typically cuts larger serving sizes, then she needs to order more cake to accomodate that.
I would make a copy of the Cake Cutting Guide from Wilton and tell her that you "look forward to working with her in the future and that you have made her a copy of the cake cutting guide so that there isn't any mis-understandings in the future."
Thanks all! Ya know, I was beginning to doubt myself.
I use the term "caterer" here loosely. She is a friend of the customer that I think wants to be a caterer. That's fine, we all have to start somewhere. Her haughty attitude is not going to help her though. She really should understand these things for her own future if this is the field she wants to be in. I don't know any other baker who would do what I am doing.
I just want my customer to be happy and not to be bad mouthed.
Thanks again for your replies, appreciate it. Now I'll go decorate this cake.
Well, the first step in resolving any problem, is to identify the problem.
Using Wilton charts, an 11x15x2::
yields 60: 1 1/2x2x4" party size servings
As a "caterer" she should know this would be the default cake size serving (since this wasn't a wedding).
Granted there are other charts, but Wilton is the most well known. (IMHO)
If the customer has specific cake serving sizes in mind, it is their responsibility to make that known to you. (You'd bake more and charge more.) 
It's grossly unfair to call after the order is in, and expect more cake because, "Hey, I want to serve larger pieces - FOR FREE."
As has been said, you upheld your end; and are now being very gracious (and generous) under difficult circumstances.
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