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Depends on the amount of pages and what else the client wants you to do. I'm guessing that there are reasons for the client to move to a CMS instead of static HTML?
I usually use these rules of thumb:
1) How much is to be done? If not a lot, chances are there are few surprises and you don't have to take too much to account for feature uncertainty
2) If you think you can do something in 10 hours, it'll take 20
3) Be pessimistic, when calculating the hours/days/months it will take to complete the work - Remember that your offer will be the starting point of negotiation.
Depending on whether you have a good relationship with the customer, there are dangers with setting the price too high: If you don't know the client he may consider you too expensive and go elsewhere or he will feel that he is entitled to add feature requests even when the project has started. If you know him well, you may seem to be taking advantage of your relationship and try to "milk" the client. However, setting the price too low is equally dangerous as it can make you feel that the client is exploiting the relationship to HIS advantage - or you'll end up disgruntled because you have more work than anticipated, but still only get paid the same amount. This in turn leads to hurried solutions, lack of testing or documentation and/or a feeling that you should be working on other things.
All in all, you should (In my opinion) set a high price that you are comfortable with. Don't say $10.000 unless you can defend that price ("I have estimated that it will take 3 working days to establish the requirements so we are both on the same level as to what should be done by me and what should be done by you. It'll take 4 days setting up the site, ensuring that the basis is working as it should. Adding content will take another 3 days and then I'll be finishing up on documenting my work and how to use the system - another 3 days. After that, I am allocating 5 days for tweaking and making sure you are happy with the solution. End result: 18 days, corresponding to approx. 125 hours. With my hourly fee of $80, it amounts to a total of $10.000")
On the other hand, if the client can be a valuable customer in future projects, you can set the price a little lower - while still making sure you are satisfied - in the hope of landing future contracts.
Last advice: NEVER slack on the quality of your work. A client is only a good client if he is satisfied with your work. Making a rushed job can secure you a profit right now, but the best promotion for web developers is a portfolio - and clients that speak ill of you or switch your solution to another one after 6-12 months because they are not satisfied are not good portfolio material.
good luck with your work.