A salesman makes both a base salary and also a commission, which is a percentage of what he sells. Each month, if his sales totals dollars, he makes a total of 2,000 + 0.1s dollars. What does 2,000 represent?
• A. his monthly base salary in dollars
B. the amount of his monthly sales in dollars
• C. his total monthly pay in dollars
• D. his monthly commission in dollars