Build an Android App in 48 Hours Max

I want to build a 4 page android app with simple select and data submission. I will provide required instructions but the attached PPT pretty much summarises everything. The process is to select items and price will be derived and payment made with a pin code. I will provide pre generated pin codes to use. All transactions will be submitted to backend. I need this as a proof of concept so i dont need any bells and whistles - i need something that works. I need a full app which includes all frontend and backend components and most importantly, i need this on the 30th by 12 noon GMT for my presentation. See attached ppt file