[quote="gluon"]The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998. Was the annual rent collected by the corporation from the building more in 1999 than in 1997?
(1) x > y
(2) xy/100 <x>y.
I say D too.
Look at the chart: Lets say rent started @ 100.
yr: 97 98 99
amnt 100 110 amnt>100.
X is 10% and Y has to be less than X. So even if Y is 9.9999999999999999999% In 99 its still greater by fractions of a penny.
or if Y is just 9% then the amount in 99 is 1 penny higher than 97.
S2: basically says the same thing as S1.
xy/100<x> xy<100x-100y. For this inequality to be true, x must be greater than Y. if it isn't then you wind up with a negative number on the right side.
Also the left side of the inequality has to be positive since we cannot have negative percentages in this problem (I think