I've recently been offered a job designing a flyer for an event that a local organization is hosting. I was asked if I could also include the project files so they could easily alter the design for the next year of this event (it's a yearly competition).
This is no problem with me and I will be sending them the project files for the design. What I do wonder however is if it is good practice to charge a bit extra for doing this? And if so, how much (in relation to the original cost) extra should I charge?
Thanks for your input!