The website says: "Efron demanded 400 coins each worth 10,000 Dinarim. There are places where 10,000 Dinarim is called 'Shekel'." Where is the 10,000 figure from? Rashi writes: Kantari- Mishkal Gadol she'Korin Centinir, Me'ah Maneh - where is the makor that 100 dinarim = 1 maneh
m,
The fact that one hundred Dinarim equals a Maneh is stated by Rashi in Bechoros (5a, DH "Machatzis").
All the best,
Yaakov Montrose