It's a simple Tip Calculator for free! You can find it at
https://play.google.com/store/apps/details?id=tk.sketchistgames.tipcalculatorfree
Tell me what you think about it!

Description
This amazing free financial tool allows you to find the tip for any meal! You can enter in the meal total, whatever percentage of a tip you want to leave and even how many people are paying! Then just hit, "Calculate" and you'll be presented with the tip, what each person pays, and the total of the meal including the tip!