Chinese coins in medieval Japan

Hi to all of you,
have one question about real value of chinese yuan bao in medieval Japan i.e. what were the salaries of state employees in this currency(soldier for example) and what he could buy in the market for the one yuan bao?
Thanks in advance.
Sensei

- Until the 14th century the usage of coins was restricted to the upper classes and people living in large cities. Later it became more popular for the lower classes to use coins instead of rice and commodities
- For 600 years until the 16th century Japan didn't issue official coins but imported them from China or Korea and many were privately minted imitating Chinese coins.
- imported coins were of high quality, many coins made in Japan were crude and often flawed were the term bita sen or "bad" coins comes from. They were made out of a wide variety of metals and inscription styles.
- In 1230 the price of rice was 1000 mon for a koku (278.3 liters).
- In 1434 a Japanese sword (not the highest quality) was valued at 10.000 mon a piece.
- in 1569 Nobunaga issued an order that prohibited the use of rice as a medium of exchange and established a fixed exchange rate between gold, silver and copper (tri-metallic-system)

that's all I have for now