Added navigation functionality of main three buttons on the MainActivity. Also added marker pass to the EnterDataActivity to indicate which of the three main buttons were pressed
Added more navigation functionality to the buttons presses. Completed 70%
Added copious comments
Added more comments and trivial toast messages responses for the button clicked in the resultActivity
Added more comments
Refactoring-Created a TransactionTracker (Singleton design pattern) to keep track of the data for a single transaction accross activity (instead of the former method of passing data thorough bundles
Refactoring-Moved the button clicking code determination to the xml file. Removed OnClickListener interface inheritance from each activity