Here's something that will read input like you've given above:

07/16/03 FAILED
07/17/03 PASSED
...

and summarizes it by week. It should give you an idea of how to modify your program to do what you want.

#!/usr/bin/perl -w

use strict;

use Time::Local;

my($days,$passed,$firstday,$firstwday);
while (<>)
{
  chomp;
  my($date,$status)=split;
  my($m,$d,$y) = split(/\//,$date);
  my($unixtime) = timelocal(0,0,0,$d,$m-1,$y);
  my(@today)=localtime($unixtime);
  my $wday = $today[6];
  $days++;
  if ($status eq "PASSED") { $passed++; }
  if (defined($firstwday))
  {
    if ($wday <= $firstwday)
    {
      print $firstday,"  ",int($passed*100/$days),"\n";
      $days=$passed=0;
      $firstday=$date; $firstwday=$wday;
    }
  }
  else
  {
    $firstwday=$wday; $firstday=$date;
  }
}

if ($days)
{
  print $firstday,"  ",int($passed*100/$days),"\n";
}
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