Answer: 34%

Explanation:
Required percentage = (145 - 108)/108 x 100 %

= 34.26%
=34%.

Answer: 32AH

Explanation:
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.

Answer: 39000

Explanation:
Required difference = [(84 - 45) x 1000] = 39000.

Answer: 1997

Explanation:
The percentages of sales of 4AH batteries to the total sales in different years are:
For 1992 = 75/543 x 100 % = 13.81%.
For 1993 = 90/528  x 100 % = 17.05%.
For 1994 = 96/525 x 100 % = 18.29%.
For 1995 = 105/510  x 100 % = 20.59%.
For 1996 = 96/465  x 100 % = 19.35%.
For 1997 = 105/495 x 100 % = 21.21%.
For 1998 = 115/605 x 100 % = 19.01%.
Clearly, the percentage is maximum in 1997.

Answer: 7AH

Explanation:
From the table it is clear that the sales of 7AH batteries have been decreasing continuously from 1992 to 1997.