How much was a copper coin in ancient times, a dime or a cent?

Copper coins were popular as early as the Qin Dynasty. First there were "Qin Banliang" and then "Hanwu Zhuqian", all of which were flat round copper coins with a square hole in the middle, so they were nicknamed "Kong Fang Brothers". The units of copper coins are Wen and Guan. A copper coin is one cent, and a thousand coins are the same. 1 Qian Wen = RMB 0.2 yuan.