This very much varies on the exchange rate. Today the exchange rate is 0.6192 from USDollars (USD) to British Pounds(GBP). So if you multiply $80 by 0.6192 you get £49.536. Thats just a raw calculation if you were to actually get the money converted you probably would get a slightly worse rate of exchange. Also note that this exchange rate is constantly changing while the international markets are open.