A.So 12 percent off $64.25 would be would be $7.71 so if you take that off of $64.25 that would be $56.54
B.So you would find 20 percent of $72.00 which is $14.40 so you take that away from $72.00 which is $57.60
C.So you find 18 percent of $68.75 which is $12.38 so you take that away from $68.75 which is $56.37
D.So you find 15 percent of $67.50 which is $10.12 so you subtract that from $67.50 which is $57.38
So the cheapest store is store C