Data Interpretation  Table Charts
The following table gives the sales of batteries manufactured by a company over the years.
Number of Different Types of Batteries Sold by a Company Over the Years (Numbers in Thousands)
Year  Types of Batteries  
4AH  7AH  32AH  35AH  55AH  Total  
1992  75  144  114  102  108  543 
1993  90  126  102  84  126  528 
1994  96  114  75  105  135  525 
1995  105  90  150  90  75  510 
1996  90  75  135  75  90  465 
1997  105  60  165  45  120  495 
1998  115  85  160  100  145  605 
Required percentage 


= 34.26%  
34%. 
The total sales (in thousands) of all the seven years for various batteries are:
For 4AH = 75 + 90 + 96 + 105 + 90 + 105 + 115 = 676
For 7AH = 144 + 126 + 114 + 90 + 75 + 60 + 85 = 694
For 32AH = 114 + 102 + 75 + 150 + 135 + 165 + 160 = 901
For 35AH = 102 + 84 + 105 + 90 + 75 + 45 + 100 = 601
For 55AH = 108 + 126 + 135 + 75 + 90 + 120 + 145 = 799.
Clearly, sales are maximum in case of 32AH batteries.
Required difference = [(84  45) x 1000] = 39000.
The percentages of sales of 4AH batteries to the total sales in different years are:
For 1992 =  75  x 100  % = 13.81%.  
543 
For 1993 =  90  x 100  % = 17.05%.  
528 
For 1994 =  96  x 100  % = 18.29%.  
525 
For 1995 =  105  x 100  % = 20.59%.  
510 
For 1996 =  96  x 100  % = 19.35%.  
465 
For 1997 =  105  x 100  % = 21.21%.  
495 
For 1998 =  115  x 100  % = 19.01%.  
605 
Clearly, the percentage is maximum in 1997.
From the table it is clear that the sales of 7AH batteries have been decreasing continuously from 1992 to 1997.