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Financial data are expressed in a unit which is conform to international standards.
Avoid misunderstandings and misinterpretations on the part of users.
Use tools that implement proper internationalization, and give the ISO code 4217:2001 of the currency, for example: 100€ (<abbr title="Euros">EUR</abbr>)
Check on the relevant pages that prices and tariffs are follewed by a monetary unit.