A.48 u.s. dollars?= 72 us dollars

64 Canadian dollars 128 Canadian dollars.
B.18 U.S. dollars=? 54 US dolalrs
24 Canadian dollars 60 Canadian dollars
C.18 us dollars=? 45 Us dollars
24 Canadian dollars 48 Canadian dollars
D. 36 Us dollars=? 54 us dollars
48 Canadian dollars 72 Canadian dollars

Check this site.

http://www.xe.com/ucc/