I agree maybe it was spelled out but without a calculator it is over their heads. ????
My wife cousin use to live with us we got him a job at a friends window shop he had his own room, food when he was hungry, hot shower all we ask save your money don't be like all the Thai go drinking all the time. One day he ask me he wanted a few Thousand baht to go out drinking I ask him where is your money he got offended I even asked I said you earned 8000 baht a month been working there over a year that is over 100,000 baht when I showed it to him on the calculator he was shocked then got angry and left came back five days later I had his bags packed set outside took the keys to the bike never saw him again been 15 years.