Customising excisting apps usinf the source code

We have developed an app for iPhone, iPad and Android that various companies in Europe requests customized versions of. The work we will need help for is very simple. The freelancer(s) we decide to offer a cooperation with, will get access to the source codes and do the needed changes there. Tasks that will be included each time is: - Changing some of the UI, basically only the main color of the app and making an app icon - Renaming existing labels / fields in the app - Changing, adding, deleting values in drop down fields in the app - Creating new forms based on the originals - Various other tasks when needed The freelancer(s) we are looking for will have to prove very good skills, and a test project will be given to see if you are able to do what is needed within a time limit. Only sucessfull test task will be paid. If you believe you are up to this task, and you can prove that you have delivered apps of high quality, you are welcome to bid. On the "standard" task we will agree on a standard amount that these tasks are worth. We already have developers working for us, so we have already decided which level of money the "standard" task is going to be on. Also, we have settled a fixed price per the hour and it will be up to you to offer your services if we start to negotiate. To see if you have read all the text and that you have understodd the meaning of it, please write in you reply the answer on this: what fo you get if you multiplies seven with two?