Marketing activities of firms

Question

A student would like to know the percentage of revenue that is spent for marketing in most of the companies that sell computer equipment and printers, etc. such as Future Shop, Office Depot, Compusmart, etc.

I can find sales and revenue information, but not expenditure by the companies.

Answer

Presuming you are after Canadian information, and information at an industry level (no named companies) for both public and private companies, try Performance Plus:
http://sme.ic.gc.ca