If you have a smart phone or tablet there are some really good apps (CakeUlator) available which can help working out cake prices. One or 2 people I know locally who have recently started up small cake businesses have found them really useful. You enter the recipe, baking time, decorating time, profit etc and the app gives you the price you should charge.
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Heidi, Norwich, http://www.cutelittlecupcakes.co.uk