Complete my Simple Maths App (needs design, audio, and FB integration)

Hi, I have created a simple Maths App and all you will need to do is the following: - Graphic Design, App Icon and also general design for App to make it stand out - Sound for App, for general play and when user gets an answer right or wrong - Complete Facebook Integration, I already have the SDK integrated and working, just need to save Facebook User to Firebase with their score if user is signed into Facebook I have written all the code in Objective C and used CocoaPods to add in some Flat UI controls and Firebase. The code will remain mine and you will not be allowed to re-use or re-distribute the code on any other Project. Since I have done the majority of the work, the most I would like to pay for this will be $75 AUD, but if you can show me something amazing when you send through your bid to make me think you will be able to make this a top app on the App Store then I'll be willing to pay a little more.