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 <?php
 /**
  *  ocs-webserver
  *
  *  Copyright 2016 by pling GmbH.
  *
  *    This file is part of ocs-webserver.
  *
  *    This program is free software: you can redistribute it and/or modify
  *    it under the terms of the GNU Affero General Public License as
  *    published by the Free Software Foundation, either version 3 of the
  *    License, or (at your option) any later version.
  *
  *    This program is distributed in the hope that it will be useful,
  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU Affero General Public License for more details.
  *
  *    You should have received a copy of the GNU Affero General Public License
  *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  **/
 
 class Default_View_Helper_CalcDonation extends Zend_View_Helper_Abstract
 {
 
     const paypal_fix = 0.3;
     const paypal_var = 0.029;
     const tax = 0.19;
 
     public function calcDonation($tier)
     {
         //$v = ($tier + self::paypal_fix)/( 1- ( ( self::paypal_var/(1+self::paypal_var)) + (self::tax/(1+self::tax)) ));
         $v = ($tier + self::paypal_fix)/( 1- ( ( self::paypal_var) + (self::tax/(1+self::tax)) ));
         return number_format($v, 2);
     }
 
 }