Thai Signs: 3 Bags for 100 Baht
In Thai this sign reads as “sam tung neung roi baht”. The word “tung” with short “oo” sound, means “bag”. It is also the classifier for bags. The common word for a bag is “gra-bpao”.
ถุง (tung)
Richard Barrow in Thailand
Writing about Thailand on Blogs and Social Media
As far as i know Thai people usually do not use "nueng" while saying "one hundred". i mostly heard simply "roi bath"