求助：29－GWD13之第4套数学

fly_holly

Q29:

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)      < x – y

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

我的答案是D，但是给出的标准答案是B，百思不得其解，望大牛指导！

程雅祺

（1+X)(1-Y)>1

1+X-Y-XY>1

X-Y>XY

如果答案没有贴全的话，（2）应该是xy< x-y