Coins
In (my) typical fantasy world, a basic coin used is copper coin, used
for daily purchases. It is casted locally, and foreign money is bot
usually accepted, and have only value of pure metal, which is usually
worth 10% of coin value.
Gold is the most expensive coin, worth 100 copper (or 10
silver). One coin weights about 10 g, and thus 100 goes into one
kilogram.
Silver coins are usually used when buying more expensive
things. 1 silver coin is worth 10 copper coins, and each weight
about 5 grams, and thus 200 coins weight one kilogram.
Copper coins are basic coin used, and weight about same as
silver.
Tin pieces are used for change, and 10 is worth one copper
coin. They weight as silver or copper, but have practically no value
as pure metal.
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