Many commissioned sales people receive a base salary, plus additional pay based on either sales dollars or units sold. The following information is for the first quartery of this year:

Month             Units Sold         Salary Costs

January                 4,100              $20,350.00

February                 4,000            $20,000.00

March                 4,200                 $ 20,700.00

Based on the information in Question #3, how much is the fixed cost of salaries each month?