Where do you come up with your per serving prices? I am new to this and I was basically going to charge for the cake as a whole not per slice. I made 2 pound cakes tonight and I was thinking if i sold them i would sell them between 8 and 10 dollars. Just wondering. 
Some cakes you are better off charging for as a whole (the smaller cakes in particular), price dependant on ingredients and time it took you to do the cake. For larger cakes (40+ servings), then a per serving charge will work OK (and give you a bigger profit for the big cakes!). I have a minimum charge for all cakes ($60), and then I work from there. My party cake servings start at $2.75 per serving, wedding cakes start at $4.50. I charge extra for fondant, modelling and 3D work. Hope that helps!
Welcome to CakeCentral! Setting prices is hard, my article here may answer some of your questions.
The link is not working... Perhaps you could add it again?
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