In a Medieval Age (there is like a mix of low, mid, high age + magic, so It's undefined), I was making the economy and I want to use copper (4,48g), silver (5.245g) and golden (9.65g) coins, the "(Xg)" is the weight of each coin (0.5cm3).
What would be the rate of between copper > silver > gold?
I always think in 100:100:100 but this is very unrealistic, I found in internet that in medieval ages silver > gold was 12:1, but I am not sure. I also found other rates, like 100:10:1.
And, What can be the "acquisition power" of each coin?
I mean, can I buy a loaf of bread with one copper coin? How much would a beer cost, or a decent meal or one night in a hotel (inn)? Or simply, what is the ratio of silver > dollars?.