Then let's take a look at the exchange rate relationship between Thai baht and RMB today: 1 Thai baht =0. 1899 RMB, and then calculate it according to the formula of foreign exchange amount × bank buying exchange rate = local currency amount.
We clearly know that the foreign exchange gold coin is 20 baht, and the bank buying exchange rate is 0. 1899 RMB. So the amount in functional currency is 20× 0. 1899 = 3.798 yuan.
Because the exchange rate changes every day, the correct answer can be calculated according to the exchange rate at that time. I hope my answer is helpful to you.