Where the choice of an entity's functional currency is not clear-cut,the choice should be based on currency of largest proportion of export sales.

Functional Currency

The currency of the primary economic environment in which an entity operates and generates cash flows.

Currency

A medium of exchange for goods and services, typically issued by a government.

Clear-Cut

Unambiguous or obvious, often used to describe decisions or distinctions that are straightforward and easily discerned.