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By Jan Zumwalt
Ver 1.2 - 2014.08.01
Copyright - Public Domain

+------------------------------------------------------------+
| The retail and markup prices may be customized by          | 
| adjusting values at about line 160~175 of this program.    |
+------------------------------------------------------------+

+-----------------+
|  Instructions   |
+-----------------+-------------------------------------------
Enter the one or two values in the white or red boxes and 
select the appropriate button to calculate the missing answer(s). 
Percentage should be entered as a whole number; i.e. 33 for 
33% (not .33).

+-----------------+
|  Note           |
+-----------------+-------------------------------------------
For convenience the input boxes above use whole numbers for 
the percentage value (33 instead of .33). The percentage value 
is converted before using the appropriate formula. If someone 
wants to use the formulas given, they would need to use a true 
fractional value for a percentage.

+-----------------+
|  Source code    |
+-----------------+-------------------------------------------
The most current php source code of this program is located at 
https://sourceforge.net/projects/pricing

+-----------------+
|  Online version |
+-----------------+-------------------------------------------
A working online version of this program and many other tools 
are available at http://www.Net-Wrench.com/tools/price           

+-----------------+
|  Formulas       |
+-----------------+-------------------------------------------
Discount   = Retail - Sale; 
Discount%  = 1 - (Sale / Retail)
Profit     = Sale-Cost; 
Profit%    = Profit/Cost*100;     
Retail     = Cost * 1.Profit%
Retail     = Sale / (1 - Discount%) 
Sale       = Retail * (1 - Discount%) 
Sale%      = (1-Sale/Retail)*100;

For convenience the input boxes for the program use whole 
numbers for the percentage value (33 instead of .33). The 
percentage value is converted before using the appropriate 
formula. If you want to use the actual formulas, you will 
need to use a true fractional value (.33 = 33%) for a 
percentage.
Source: README, updated 2014-08-02