Hi all I was hopeing that you could tell me what this file is doing is simple math terms.
http://www.freewebs.com/thecrankyhermit/wsRubrick.zip

I'm trying to build a php based version of this file for a site. and I'm not familar with excel funtions. like
=IF(ISERROR(VLOOKUP(E210,Lookup!$A$17:$C$21, 3, FALSE)), 80, VLOOKUP(E210,Lookup!$A$17:$C$21, 3, FALSE))
I know it's kinda asking alot but i hope some excel guru out there can help.