OG12 - problem#12

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OG12 - problem#12

by venmic » Sun Jun 12, 2011 5:46 pm
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


Can anyone help

B
Source: — Data Sufficiency |

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by amit2k9 » Fri Jun 17, 2011 6:25 am
'99 = [ 1+ (1/100)(x-y)- (xy)/100 ] '97

a no clue about xy/100 not sufficient.

b 1 + [k] where k >0 as (x-y)- (xy)/100 > 0

thus '99 > '97 sufficient.

B it is.
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