Please explain steps and concepts.

9. Oaks Company maintains a cafeteria for its employees. For June, variable food costs were budgeted at $48 per employee, based on a budgeted level of 1,000 employees in operating departments. During the month, an average of 1,100 employees worked in operating departments. The cafeteria's total food costs for the month came to $57,750. How much food cost should be charged to the operating departments at the end of the month for performance evaluation purposes? a. $57,750 b. $52,500 c. $48,000 d. $52,800 e. None of the above