Having been in the bi-cultural environment for more than 30 years, I understand two sides of Japanese and American/British way of thinking to do business. Worked for software development company, semiconductor company, semiconductor equipment manufacturer, laboratory equipment manufacturer. Worked for the biggest American bank for 16 years in Tokyo.
Interpretation job - $40 - $50/hour excl. transportation and accommodation
Translation job - depends on the job, approximately $40/hour