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To properly convert a paper textbook to ebook? Lots! Some thousands of dollars - how many thousands would depend on things such as size and just how many tables and images etc. It would be very time consuming to get right. If there was an electronic version of the textbook (original source) then you might save a lot of time and money, but I still wouldn't expect it to be cheap - not if you want to get it right.
At least, that is what I expect it would cost. As to how much it would be "worth to me" ... obviously that would depend on the textbook and how many I might expect to sell.
And I would also say that not all textbooks would be able to be converted directly to a form useful on small ereaders. If you target larger tablets then most go could directly, but for smaller devices it may well be necessary to have some tables and images re-done to be very useful. I'd also suggest that the ideal textbook conversion, in many cases, wouldn't be a direct conversion. Appropriate links between related material, popup hints and so on, may make some redesign desirable.
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