Custom Reports

Good Morning. I want to state that I am a very novice user of both the product and PHP. I am trying to get two summed figures as a percentage of each other on a separate line. I have a report set up to take 2 values out of mysql. The values are NumRep and NumImage. When I tell PHPrunner to sum them I get a global object of {$global_totalNumRep_sum} and {$global_totalNumImage_sum}. When I take just these values I get the numbers themselves. I've tried a few things. I've tried:

<?php

$first_Number={$global_totalNumRep_sum}

$second_Number={$global_totalNumImage_sum}

$third_Number=100
$sum_total=$first_Number/$second_Number*$third_Number
print($sum_total)

?>
This did not work. What happens is as soon as I go from code to design mode it replaces the {$global_totalNumRep_sum} and {$global_totalNumImage_sum} with a bunch of table properties.

I've tried just randomly pushing things around. That didn't work either. I've tried yelling at it. The cold blank stare from the monitor was a little unnerving.
I went a different route and though maybe I could do it in an SQL Querry, but when I do that it gives me a strange value. I think it gives me 72% when the numbers that get populated are 262 and 12.
Any help would be greatly appreciated. Thanks in advance. Below is a snidbit of the code.
class=report border=0 cellSpacing=0 cellPadding=1 width=auto>

<TBODY>

<TR>

<TD class=blackshade>Number of Repeated Images</TD>

<TD class=blackshade>Number of Images</TD></TR>{BEGIN grid_row}{END grid_row}

<TR>

<TD class=blackshade>Number of Repeated Images</TD>

<TD class=blackshade>Number of Images</TD></TR><!--------------------------------------global summary-------------------------------------------->

<TR>

<TD class=globalsummary colSpan=2>Global summary {$global_total_cnt} -

records total</TD></TR><!-- Sum -->

<TR>

<TD class=globalsummary>Sum&nbsp; {$global_totalNumRep_sum} </TD>

<TD class=globalsummary>{$global_totalNumImag_sum}

</TD></TR></TBODY></TABLE></DIV>{END grid_block}</DIV>

{BEGIN pagination_block}<DIV id="pagination_block{$id}">{$pagination}</DIV>{END pagination_block}</DIV><B

class=xbottom><B class=xb4b></B><B class=xb3b></B><B class=xb2b></B><B

class=xb1b></B></B></DIV>{$footer}

</DIV></DIV>{END body}</BODY></HTML>