Coinage

Much trade is still barter, actual coins are rare. Most Adventures end up with stuff looted from ancient tombs which would not contain the current currency. For convenience the treasure is described in terms of the currency of the Realm.
see PHB 143
Bigger sums use bank notes which are issued by the Banks of Detroit.

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coin type	gold piece value (gp)	weight (lbs)
copper	0.01	0.02
silver	0.1	0.02
electrum	0.5	0.02
gold	1	0.02
platinum	10	0.02