This file defines reputation modification to store prices.
The first row indicates the player's reputation.
The second row indicates the percentage of the item's base price to charge.
In BG2 ToB we have:

2DA V1.0
1000
           1          2          3          4          5          6          7          8          9          10         11         12         13         14         15         16         17         18         19         20
1          1000       1000       200        150        140        130        120        120        110        100        100        100        100        100        95         90         85         80         75         70