IELTS writing currency
What is the correct way of writing currency in IELTS Academic Task 1.
Is it possible to write
- In 1999, Switzerland had the most coffee sales, with a figure of 3 million euros.
- ... with a figure of 3 million Euros.
- ... with a figure of 3 million. or do I have to repeat euros all the time
- ... with a figure of €3 million
Thank you very much!