<prompt> Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu: Passage: Muna 1978, State Bank of Vietnam Ngân hàng Nhà nước Việt Nam yakaunza mabhiri emadhora e5 hào, 1, 5, 10, 20, uye 50 đồng ane zuva ra1976. Muna 1980, mabhiri maviri uye gumi akawedzerwa, achiteverwa nemabhiri makumi matatu nemazana zana muna 1981. Mari idzi dzakamiswa kubudiswa muna 1985 sezvo dzakaramba dzichirasikirwa nemari nemhaka yokuwandisa kwemari uye kusagadzikana kwezvoupfumi. Mubvunzo: Bhengi reHurumende reVietnam rakaisa mari yemadhongi maviri neyegumi rini?  <response>: Muna 1980 