Tip Calculator.
Hours to complete: 10 ..
Required Stories:
1) User is displayed the tip of the specified percentage for specified entered amount
2) User enters the total amount of the transaction
3) User can select between tip amounts (i.e 10%, 15%, 20%)
4) Upon seleting tip amount, formatted tip value is displayed.
Optional Stories:
1) User changes the total amoount and updated tip is reflected automatically
2) User can select custom tip percentage if desired
3) User can select how many ways to split the tip
4) Experiment with trying input widgets (Imagebuttons)
5) Improve UI/colors (Flat UI, blue/white colors), used Dialog Fragments.