PHP Price Calculator: Calculate prices using arbitrary precision math

PriceCalculator
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Introduction
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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    


### Examples
Example can be found here: `/Example.php`