Assume that an investor has just received Sfr 25,000 and wants to obtain dollars for Francs. The exchange rates posted by four U.S. banks are as follows: 

A 1.6357  72 Sfr/$ Bank 

B 1.6116  33 Sfr/$ Bank 

C 1.6261  80 Sfr/$ Bank 

D 1.6531