B, Statement 2 is sufficient.
from Statement 1 we know that X>Y, however it is not sufficient, 2 cases :

A=annual rent=1000

x=20%

y=19%

97=1000

98=1200

99=1000-228=772

->

97 > 99
A=1000

x=50%

y=10%

97=1000

98=1500

99=1350

->

97 < 99
From statement 2, we know that (x * y)/100 < x - y

or xy < 100(x-y), so x>y

You can find fast by picking number that if you want to get 97 > 99

Y has to be close to X as much as possible, however without going more than X and the product XY must be inferior to 100 times the difference between X and Y.

Finally, you'll realize that if you go more than 9% with Y you need to give soon 2 points of difference to X

if Y=10, X must be at least more than 11

and it goes on like this more and more...after many numbers the gap between X and Y is more and more important so there's no way 97 > 99, 97 is always < to 99 because X tend to be higher and higher faster than Y

Sorry for not having a scientific or algebric explanation