So here's a question that's probably been left hundreds of times. I am still very new at this so I'm still trying to figure out my pricing. My friend has asked me how much I would charge her for a cake to serve 25. Lets say she asks for a 9" and 6" stacked two layer cake. Now I know that technically serves more than 25. So...My question is...do I just take her 25 people and multiply it by my price? Or do I charge her by the actual number of serving the cake provides? Please tell me what you recommend.

You charge by the actual # of servings the cake will provide.
For only 25 servings one only needs a 9x4" round OR 9x13 sheet or similar.
One recipe of my *original* WASC cake will be just the right amount for serving 25 people
If you have the grocery-store cake pans.......you know 9" round by 1" deep = bake 2 layers of that and one layer 6" round (in a 2" deep pan) and it will be just right.......a nice 2 tiered ccake w/o going way over the amount of servings they want.