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I think a lot depends on what you're selling, how well you understand AdWords and how it works, etc.
If you're in a heavily competitive or saturated market, you could wind up paying quite a bit for advertising with very little ROI (Return on Investment).
Also important is how well you write your ad copy, how targeted your ad(s) are/will be, etc.
There's just so many variables that a direct, specific answer is next to impossible.
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