Hello, because the net value of China market was 2.45 yuan at the beginning of 2007 and 7.49 yuan at the end of 2007. I don't know the exact date of your purchase in 2007. So the average valuation is calculated in 5 yuan, 20,000 ÷ 5 = 4,000 copies; Now the net value is 18 yuan, 18×4000=72000.00. Therefore, the China market chooses the current valuation of 72,000.00 for your reference.