Hey guys this is my friends first time creating an app for the app store. A client has hired him to do an app and he was wondering what the standard is for developers to charge. Should he charge a flat fee? Charge by the hour with a retainer involved. what about the percentage of sales of the app? if you guys can refer me to anyone who might have answers to these questions please please post here or pm me. I'm wondering if he should also do a contract for his work....Well idk and i figured i start here.