Briefly, my practice – spelled out in initial contract emails – is to include typo corrections in the basic charge. This should also include reasonable amendments, and this might be helpful: I did a book design recently where the client saw the proof copy and decided the bottom margin was a bit too narrow; I agreed, and considered it my problem, not the client's. Then he decided he'd prefer less leading and a different font: that meant going through the whole book checking for new widows and orphans, re-ordering chapter headings where they'd moved from left to right page or vice versa, and re-doing a 6-page detailed index! I agreed with the client that this work would be extra and I would charge an hourly rate.
It boils down to: include in your initial price a reasonable level of corrections, and beyond that don't charge where you feel responsible, but do charge for client amends which should have been sorted out before the job came to you.
I have to quote for a non-profit A4 36-page quarterly magazine, probably full colour. Can't find a source for typical rate per page: can anyone suggest?
I don't want to charge by hour, especially as setting up takes time I wouldn't charge them (though I would to a commercial client!)
Thanks for any help.
