Rates are to be negotiated on a case by case basis, but you can use these numbers to get a rough impression of your expected expenses.
For translation, think of $ 0.11 (£ 0.085 / € 0.10) per word of source text.
When paid by the hour, for example when proofreading, think of $ 42 (£ 31.66 / € 37.50) an hour.
(As of January 1st, 2020, no value added tax applies.)