This is another question that you need to answer by yourself. Some say that translation pays less than 1,000 yen per hour and others say it can produce more than 200,000 yen per hour. It all depends on the volume of work and its kind. Knowing why a particular company is asking for information about your rate is also essential. Sometimes you need to ask for it for the sake of understanding the actual situation of your job. It would help if you were smart enough to know why they ask this and what they want.