Need a very simple iphone app with just 3 screens

Hi We are looking to get a very simple iphone app built which will consist mainly of 3 screens. This is more like a quiz where the user gets a random question with multiple choice questions and he is supposed to answer the question. He gets a set of 15 questions and he gets +10 for each correct answer. After completing 15 questions he can either play again and another random set of 15 questions come up or he can share his score on Facebook wall. We will provide you with the database of 2500 questions with choices and correct answer. Need game center and advertisement integration (iAd or mobclix) too. Screen mockups will be provided to the winning bidder. Our budget is 60-80 USD for this app. Any bids above that budget point will be rejected outright so pls dont waste your time bidding higher than 80 USD. No milestones, all payments after delivery. We will make sure that both parties are safeguarded in terms of fairness. We will need the source code at the end of this. Much more work will be given to the winning bidder if this project goes well. We have been giving much more work to the freelancers we found via this site already.