The profit is about 3-4 yuan. According to the relevant information on the Internet, the cost of a cup of double-skin milk is as follows: double-skin milk powder 35 yuan//kloc-0 /kg (1:1:10), sugar 7 yuan/kg, 100g of double-skin milk powder (3.5 yuan)+100g of white sugar (0.7 yuan)+1000g of water to make about1200ml of liquid, and use a 250 cup (actually175-/kloc-0. Add up to 1. 1 yuan, plus other time costs, electricity costs, etc., the cost of a cup of double-skin milk is about 1.5, so the profit is about 3-4 yuan.