Plurals
Bosnian, Croatian and Serbian have a complicated case system. In combination with the numbers 2, 3, and 4, nouns use the paucal form, which is marke in this case. In combination with numbers 5 or more, nouns use the genitive plural, or maraka. As for the fening, the paucal is feninga with a short unstressed a, whereas the genitive plural is feninga with a long unstressed a.
These matters should be noted when one uses the local names in English. For example, "ten feningas" is incorrect as the final "a" in "feninga" already indicates the plural. The Central Bank of Bosnia and Herzegovina (CBBH) uses "fenings" as the English plural. Likewise, "ten marks" is correct, not "ten marakas".
Read more about this topic: Bosnia And Herzegovina Convertible Mark