Search in program

I want to ask, if i have 2 tables, and if i need to find information that not exist, i need to grab one line data from first table, and other from other table, multiplicat them and after that i need to find value.

ex.
User want to find information of client wich both products off 200$, so i need to multiplicate records from table.products(price) and table.order(deal) . and compare them with user application.

so how do i need to do it :)

thnx

Visual FoxPro2

im not really sure what your trying to do... i know what your trying to do is very simple because your just comparing fields but the way you are asking the problem is hard for me to understand. try explaining it better and i will be able to help you.