What is the range of punishment for class b misdemeanor of theft of 297$ at Walmart it is also the second theft from Walmart

With a previous misdemeanor conviction, the minimum punishment for conviction of a subsequent class B Misdemeanor is 30 days in jail. That would make the punishment range 30 days to 180 days.  See Texas Penal Code 12.43 https://statutes.capitol.texas.gov/Docs/PE/htm/PE.12.htm