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The copper tarsk bit
Basic unit of currency.

The copper tarsk
Equivalent to 8 tarsk bits.

The copper tarn
Equivalent to 2 and a half copper tarsks or 20 copper tarsk bits.

The silver tarsk
Equivalent to 40 copper tarns, 100 copper tarsks or 800 copper tarsk bits.

The gold tarn
Equivalent to 10 silver tarks, 400 copper tarns, 1000 copper tarks or 8000 copper tarsk bits.

The double wieght gold tarn
Equivalent to 2 gold tarns.

For example, a 'double tarn' is twice the weight of a 'tarn'. It seems there are usually eight tarsk bits in a copper tarsk, and that these are the result of cutting a circular coin in half, and then the halves in half, and then each of these halves in half. An analogy would be cutting the round, flat Gorean loaves of Sa-Tarna bread into eight pieces.

There are approximately something like one hundred copper tarsks in a silver tarsk in many cities. Similarly, something like ten silver tarsks would apparently be equivalent, depending on weights, etc., to one gold piece, say, a single 'tarn'. Accordingly on this approach, the equivalencies, very approximately and probably only for certain cities, would be eight tarsk bits to the copper tarsk, one hundred copper tarsks to a silver tarsk, and ten silver tarsks to a gold piece, a single tarn. On this approach, there would be, literally, 8,000 tarsk bits in a single gold piece.   -Magicians of Gor, p. 469

A golden tarn disk was a small fortune. It would buy one of the great birds themselves, or as many as five slave girls.   -Tarnsman of Gor, p. 191

Five pieces of gold, in its way, incidentally, is also a fortune on Gor. On could live, for example, in many cities, although not in contemporary Ar, with its press on housing and shortages of food, for years on such resources.   -Magicians of Gor, p. 468-469

Actually, fifty silver tarn disks was an extremely high price, and indicated the girl was probably of high caste as well as extremely beautiful. An ordinary girl, of low caste, comely but untrained, might, depending on the market, sell for as little as five or as many as thirty tarn disks.   -Outlaw of Gor, p. 193

..In many paga taverns, one may have paga and food, and a girl for the alcove, if one wants for a single copper tarsk. Dancers, to be sure, sometimes cost two.   -Renegades of Gor, p. 51-52