Filemaker7 Advanced Sorting (easy task)

I'm tring to implicated a fairly complicated sorting solution for my Filemaker7 database but shouldn't be too hard for the experianced. Heres what it is: Each Record has one assigned keyword and a price value. I want each record which has the same keyword to find the total average of price. This average is then sorted accending with the other keyword price averages. For the knowlegable person, this should take only 10 minutes max so the maximum bid for this will be up to $15US by paypal only.