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An exchange rate was the rate at which one currency was be exchanged for another. In the Twelve Galaxies, one krin was equal to 200 kavlons, 90 forvalars, or 4,000 trynties. The Thirteenth Doctor, who was not familiar with any of these currencies, noted that she was "a bit behind on [her] exchange rates." (TV: The Ghost Monument)
In 2008, 1 Pound Sterling was worth slightly more than fifty Sto credits. (TV: Voyage of the Damned) £1 was worth approximately 5.1 Hyspero Dirnas. (PROSE: The Panda Book of Horror)