Based on the questions you are asking you don't know anywhere near enough to run a scrap yard with a shredder.
The most glaring problem is that your profit estimates are way off reality. A well run ferrous scrap yard with a large shredder has a net profit margin of 10% or lower. Even a well run yard can lose money over a number of months or have a bad year.
The best way for you to properly learn the business is to start as a feeder yard for a larger yard with a hungry shredder. After a few years learning the in and outs of the business then you could consider moving up to acquiring a shredder.
You should read this American Recycler article on shrinking profit margins in the scrap yard business. One problem nationwide is that there are already too many shredders installed.
American Recycler News, Inc. - Dealing with shrinking profit margins
Also read this SMF thread:
http://www.scrapmetalforum.com/gener...rks-oh-my.html
If you insist on going forward please put together a full blown business plan and have it vetted by some sucessful business people. Also take some time to look into and visit scrap yards that are up for sale. And look into yards that have gone out of business and why they are defunct.
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