A salted fishapos;s

The old man calculated for a moment and quoted a price four cents less than what he had initially said.,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.,Someone asked, "Yan Er, are there still many stones like this in the quarry"。