What is the Weight Reduction with Each Added Pulley in a Pulley System?

[archimedes33]

I am working on making a system of pulleys and a lever. I am planning on using a complex pulley with a few blocks. I wanted to know what how much weight is taken off with the addition of each pulley. If anyone knows some of the equations involved it would be much appreciated. I was planning on lifting about 200 lbs.

 

[russ_watters]

Welcome to PF.

Try the wiki first and if you have any more specific questions, please feel free to ask: http://en.wikipedia.org/wiki/Mechanical_advantage