AHi so my stepmum got asked to baked 24 cupcakes for a birthday , the customer wanted a ninja turtle theme with little ninja turtles on top how much do you reckon she should charge per cupcake? Never done this before. She usually always under charges cause she's to nice. Any suggestions?

Thank you for your thread, pricing has been asked many times previous on the forums, please start here:  

http://cakecentral.com/t/764720/policies-for-posting-the-cake-decorating-business-forum

Then I encourage you to check the stickies at the top of the business forum for pricing matrixes as well as using the search function to read the thousands of other threads dedicated to pricing.