math
posted by Penny .
Which rates are equivalent?
A. 36 us dollars/48 canadian dollars= 54 us dollars/72 canadian dollars
B. 18 us dol./24 can. dol.= 45 usdol./48 can. dol.
C. 18 us dol/24 can dol.= 54 us dol/60 can dol.
D. 48 us dol./64 Can Dol= 72 US dol./128 can dol.

In all of the first expressions, 3 U.S. dollars = 4 Canadian dollars. Or, put another way  3/4 (75%) of a U.S. $ = 1 Can. $.
Let's take 3/4 of the Canadian dollars in your problem.
A. 3/4 of 72 = 54
B. 3/4 of 48 = 36
C. 3/4 of 60 = 45
D. 3/4 of 128 = 96
Do you see the correct answer above?