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Then the customer doesn't have to pay. If you don't know what the problem is and aren't sure how much it's going to cost, you bill by the hour.

I've never in all my years had this problem. There never was something I couldn't fix, but there were plenty of things that took more time than I initially thought. I usually tell the client "it seems that I won't be able to complete the task in the time of the original estimation, do you want me to stop now and you don't have to pay, or do you want me to try for an extra 1-2 hours and get it fixed?"

People always seem to pick the latter, and I haven't had any unresolved problems or unsatisfied customers yet....

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