How much does it cost to open a tea shop in Singapore? According to founder of local milk tea brand Amacha, Sebastian Ang estimates that it comes up to about $209,000. Sebastian broke down the costs in an Instagram video posted on Sunday (Sept 27). The 35-year-old begins by sharing the rental costs. "Our rent here is about $15,000 a month. We have to put down three months of rental deposit plus the first month's rent," said Sebastian, which adds up to about $60,000 up front. "Then comes one of our biggest costs: Renovation," he said. The store's wooden structures and carpentry cost around $15,000 and the storefront walls as well as nooks…