Urgent Help: Company asked me for my research proposal
This is a sufficiently common request that I'm actually surprised that you didn't get it ahead of time. Breaking down your question:


  My question is, should I send the actual proposal (about 100 pages) or a summary?


The actual proposal, with a summary in the front for the TL;DR crowd.


  Is it ethical?


Unless there is identifiable information about your subjects, proprietary information about the other company, etc. in there, is there any reason why it would be unethical to send a research proposal? Just asking "Is this ethical" isn't terribly useful - you should have a specific concern. In that case, you could leave out that information with a note as to why it has been omitted. But a research proposal usually doesn't contain information like that.


  Am I allowed to do that?


No one can answer that but your advisor, but I'd be surprised if the answer was "No".


  I cannot contact anyone from my school to ask these questions but until Monday. I really would like to reply to the company right away because I need the participants.


If it would make you more comfortable, you could prep everything and then check early Monday morning - it's doubtful a delay over the weekend is going to change the company's response in a meaningful way.