In the expression for the total earnings of the salesman, \( 2000 + 0.1s \):
- \( 2000 \) represents a fixed amount that the salesman earns regardless of his sales. This amount is his base salary.
- \( 0.1s \) represents the commission he earns, which is 10% of his sales total \( s \).
Thus, \( 2000 \) represents the salesman's monthly base salary in dollars.