Currency

=Exchange Rate= 1 gold coin (100,000) = 10 silver coins = 100 large copper coins = 1,000 copper coins.

Intuitively, 1 copper coin is worth 100 Yen. The price of wheat for 1 day's needs is 2 copper coins (the amount of wheat for 1 person for 1 day is about 1 kg). 1 kg of wild boar pork is 3 silver coins (30,000 Yen). About 1 liter of cheap wine is 1 large copper coin and 2 copper coins (1,200 Yen).

So by intuition, 25 gold coins is about 2,500,000 Yen. 1 liter is about 1 silver coin (10,000 Yen).