29. The annual rent collected by a coporation 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 coporation from the building more in 1999 than
in 1997?
(1) x>y
(2) (xy)/100<x-y
答案是B
請問式子是怎麼導出來的呢
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