Depends on where you're at in the world pricing will vary. Call around to other cake shops and see what they would charge, how many is the cake for? are you renting a kitchen or work from home? how much will it cost you to make the cake? Most ppl will price the cake per slice so anywhere from $2.00-7.00
hth
FYI, it is also important to note that it is illegal in NY to sell cakes made from home, unless you have a kitchen in a separate building on your property. If you just make cakes for close friends and family the risk is pretty low, but once you start selling to strangers you are opening yourself up for a huge amount of liability.
I recommend not accepting any form of compensation for this cake until you are fully licensed and insured.
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