I finished HBO's Rome and there were three currencies used: Denarii, Drachma, and I think Egypt had a unique one. What would the exchange rates between these be? I know correlating currencies even 200 years ago is notoriously hard, but can you give me an idea of how valuable these would have been? (How much for an average day's food, how much to have someone killed, etc.)
Egypt would have used the Tetradrachm during this time period near the end of the Ptolemaic Empire. Rome would modify the Egyptian currency slightly but allow it's own form of currency since it was specially under the direct control of the Emperor.
A denarius was supposedly a single days wage (the Romans manipulated their currency to be worth basically what they wanted, not necessarily it's actual metallic value) whereas a half a drachma was considered enough for subsistence for a day. Therefore by this calculation a drachma was roughly twice the value of a denarius and a tetradrachma would be worth 4 drachma and 8 denarius.
Of course these are extremely rough and crude estimations, as actual conversions are nearly impossible to come by (especially given the fineness and purity of coinage regularly changed)