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It isn't just the application. It is writing quality essays, and tracking all the varied deadlines and sending FA paperwork in the various formats requested (IDOC, snail mail, fax, .pdf) -- you will find colleges all over the costs on what they will expect.
Costs - about $500 for sending test scores and profiles, plus the application fees - $1,000 there, for a total of $1,500 in application fees.
There is no reason for a well thought out list to have 20 colleges on it.