If euros sell for $1.91 (U.S.) per euro, then for currency
conversion to dollar into euro will be calculated as (1/Rate for
Euros per Dollar).
Thus, dollars sell for in euros per dollar = (1/euros sell for
US Dollar per euro)
                                              Â
                              Â
= (1/1.91$)
Euros                           Â
                                                                              Â
= 0.523560209 Euros
                                                              Â
              Â
= 0.54 Euros per dollar