Devall Lite is the FREE version of the full app Devalluator!
It's a neat little app designed to make calculating percentages fast and simple.
The lite version provides the basic function to work out what the percentage off a given value is.
All you have to do is enter the value using the large number keys, press "Calculate Percentage" then use any combination of the large percentage keys to find out the answer.
Ideal for shopping environments when you just want to quickly find out the discount on that special pair or shoes!