Data Interpretation  Bar Charts
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The bar graph given below shows the data of the production of paper (in lakh tonnes) by three different companies X, Y and Z over the years.
Production of Paper (in lakh tonnes) by Three Companies X, Y and Z over the Years.
Percentage change (rise/fall) in the production of Company Y in comparison to the previous year, for different years are:
For 1997 =  (35  25)  x 100  % = 40%.  
25 
For 1998 =  (35  35)  x 100  % = 0%.  
35 
For 1999 =  (40  35)  x 100  % = 14.29%.  
35 
For 2000 =  (50  40)  x 100  % = 25%.  
40 
Hence, the maximum percentage rise/fall in the production of Company Y is for 1997.
Average production of Company X in the period 19982000
=  1  x (25 + 50 + 40)  =  115  lakh tons.  
3  3 
Average production of Company Y in the period 19982000
=  1  x (35 + 40 + 50)  =  125  lakh tons.  
3  3 
Required ratio = 

=  115  =  23  .  

125  25 
Average production (in lakh tons) in five years for the three companies are:
For Company X =  1  x (30 + 45 + 25 + 50 + 40)  =  190  = 38.  
5  5 
For Company Y =  1  x (25 + 35 + 35 + 40 + 50)  =  185  = 37.  
5  5 
For Company Z =  1  x (35 + 40 + 45 + 35 + 35)  =  190  = 38.  
5  5 
Average production of five years is maximum for both the Companies X and Z.
The percentages of production of Company Z to the production of Company Z for various years are:
For 1996 =  35  x 100  % = 140%.  
25 
For 1997 =  40  x 100  % = 114.29%.  
35 
For 1998 =  45  x 100  % = 128.57%.  
35 
For 1999 =  35  x 100  % = 87.5%.  
40 
For 2000 =  35  x 100  % = 70%.  
50 
Clearly, this percentage is highest for 1996.
Percentage increase in the production of Company Y from 1996 to 1999
=  (40  25)  x 100  %  
25 
=  15  x 100  %  
25 
= 60%.