"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, footnotes, page 469
So, using this formula
8 copper tarks bits = 1 copper tarsk
100 copper tarsks = 1 silver tarsk
10 silver tarsks = 1 gold tarn
