If you're going to explain the value of a depreciated currency, it might help to provide some more common reference. In this case, it can get a bit confusing though.
The modern equivalence of the ryo changes depending on when you are in the Edo period, at the start it was equivalent to ~100,000 modern yen but it fell off pretty hard to just 3000~4000 modern yen at the end when it was directly replaced by yen, but that wide fluctuation makes it less than ideal as a reference for the currency in question. The generalized conversion to 1 ryo breaks down into 4000 mon, but that conversion also fluctuated a fair bit while the currency was still in use. Once the sen (1/100 yen) was introduced 10~20 mon was worth 1 sen (the metal used to make the coin determined the value) because the yen was still a very valuable currency.
In modern terms, 1 mon was roughly equivalent to 2~4 modern yen.