Summing the results in a collapse

[John Martyniak]

I have been using the Collapse extension, and have it working pretty  
good.

However I would like to find out if there is a way to show the  
collapsed results, and then sum up a field of one of the remaining  
results.  For example

I display "Result 1, (There 20 results, totalling $50.00).  Where the  
"20" would be the number of items returned from the collapse, and the  
"$50.00" would be the sum fee field in the 20 collapsed results.

Any help would be greatly appreciated.

Thank you,

-John