1 If each string sells for 1 yuan, the cost will probably be around 0.6 yuan, and the profit will probably be around 0.4 yuan. If each string sells for 1000 a day, the profit of 1000 a string will probably be around 400 yuan.
If each string sells 1.5 yuan or 2 yuan, the profit of each string is 6 -8 cents, so the daily profit of selling 1000 strings is between 400 yuan and 800 yuan, which is a conservative estimate, or even higher.