Khoums
The khoums (Arabic خمس, "fifth") is the subdivisory unit of the Mauritanian Ouguiya. Five khoums make an ouguiya, hence one khoums can be expressed as MRO/0.2; two as 0.4, four khoums as 0.8, etc. However, due to the khoums's extremely small value (about 1/1,570th of €1 as of 2003), the khoums probably fell into disuse as a unit of account quite some time ago.
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