<?php 
  /* Regla de tres simple para abmso cálculos
   * 1000 = $5 = 100%
   * 30   = $x = n% 
   */
 
  //base
  $base = 1000;
  //ganancia maxima
  $max_ganancia = 5;
 
  //valor
  $points = 2000;
 
  // cálculo de porcentaje y ganancia
  $porcentaje = $points * 100 / $base;
  $ganancia = $points * $max_ganancia / $base;
 
  //poniendo dos decimales a la ganancia
  $ganancia = number_format( $ganancia * 100, 2 );
 
  echo $points." => ".$porcentaje."% - $".$ganancia;

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