Read the context and answer the following question.

Thirty-three-year-old Ram Saran works as a daily-wage labourer in a wheat flour mill near Ranchi in Jharkhand. He manages to earn around Rs 1,500 a month when he finds employment, which is not often. The money is not enough to sustain his family of six— that includes his wife and four children aged between 12 years to six months. His wife Santa Devi, works as a part-time maid in a few houses and manages to earn another Rs 800. They manage a meager meal of dal and rice twice a day, but there’s never enough for all of them. His elder son works as a helper in a tea shop to supplement the family income and earns another Rs 300, while his 10- year-old daughter takes care of the younger siblings. None of the children go to school. 

Where does Ram Saran's elder son work?