The sale price according to purchase price and margin
The margin by purchase price and sale price
The purchase price according to sale price and margin
After 1 year, advertising is now enabled in order to pay the developer, please contact email@example.com to get a paid version to 1 euro / dollar
QR code and Scan bar used
Beware the QR code is fully read.
If there is no single number no less than 10 million then it is not retained!
Division by 0 that could occur is an old story ...
This release can be used with the old and new android 4.1