Find the photo of the $20 gold coin on 3 Fixed Exchange Rate Systems and the specifications in its caption. Calculate the U.S. dollar price of 1 ounce of gold under the pre-1913 gold standard. Now use the Internet to find details, including gold content, of a British gold sovereign coin worth £1 in the same era. Calculate the British pound price of 1 ounce of gold under the pre-1913 gold standard. Now compute the implied pound–dollar exchange rate. Check your answer against the value given in the text.