Library helps calculate products sales price components such as net, gross, vat with
using BCMath (http://www.php.net/manual/en/book.bc.php) for all arithmetics operations.
Moreover PriceCalculator offers several algorithms to build price net:
* Fixed price over purchase price
* Fixed percent over purchase price
* Manually set net without any margin
Additionally it is possible extend library by adding own net price strategy.
### The areas of usage
* Calculation product sales price
* Form price that's includes several fees like delivery, insurance etc.
* Build price that vary from region
* Simply calculate VAT, gross, net
Example can be found here: `/Example.php`