Oh yeah, you're right, I forgot about that. It doesn't really get used much except occasionally for very small transactions, usually ones less than 10yuan.

nobody really use jiao (1/10th RMB/CNY), same as nobody really use yuan (CNY/RMB)

they are called mao (1/10th RMB/CNY) and kuai (CNY/RMB) in China

but mao pretty much dont exist anymore now with electronic QR payments everywhere even in food stalls, heck even beggars have QR codes and fen is for many many years more like some monopoly money papers