Gre verbal Reasoning and Quantitative Reasoning With Explanations

When graphical data presentations, such as bar graphs and line graphs, are shown
with scales, you should read, estimate, or compare quantities by sight or by
measurement, according to the corresponding scales
. For example, you can use the
relative sizes of bars or sectors to compare the quantities that they represent, but be aware
of broken scales and of bars that do not start at 0.
3.
The questions are to be answered only on the basis of the data presented, everyday
facts (such as the number of days in a year) and your knowledge of mathematics
. Do
not make use of specialized information you may recall from other sources about the
particular context on which the questions are based unless the information can be derived
from the data presented.
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Data Interpretation Sample Questions
 
Questions 1 to 3 are based on the following data. 
Figure 8 
Annual Percent Change in Dollar Amount of Sales at Five Retail Stores from 2006 to 2008
Store 
Percent Change 
from 2006 to 2007 
Percent Change 
from 2007 to 2008 
P
10 
Q
R
-20
5
-10
9
12
S
-7
-15
T
17 
-8
1. If the dollar amount of sales at Store 
P
was $800,000 for 2006, what was the dollar amount of
sales at that store for 2008?
A. $727,200
B. $792,000
C. $800,000
D. $880,000
E. $968,000
Explanation
According to Figure 8, if the dollar amount of sales at Store 
P
was $800,000 for 2006, then it was 
10
% 
greater for 2007, which is 110
% 
of that amount, or $880,000. For 2008 the 
amount was 90%
of $880,000, which is $792,000.