Development of a simple Android app

Dear All, We are looking for someone to design a very basic Android app. We would like the app to have a simple UI and 3-4 screens in total. The app should be able to approximate the amount of caffeine needed to stay alert during a meeting. The user will be able to enter in their information (age, weight...) and the information about the meeting (length...). Then the app should be able to approximate the amount of caffeine necessary to survive the meeting. Since this app will be used for entertainment purposes and the results will be approximate, only a few simple calculations will be involved. Finally, we have noticed that not all bidders read the full product description prior to making a bid, therefore please write the word "Interested" at beginning of your reply. Thanks! Outsourcersss