A salted fishapos;s

"Then I'll order 20,000 blue bricks and 20,000 red bricks. Uncle, give me a discount.",On the road, Qi Si Dao said: "Yan Er Ge, I brought silver.",He was going to the quarry to see if they also used copper coins for transactions. If so, he would take his silver and exchange it for copper coins first, then use the copper coins to pay, making a profit on the difference.。