The southern region must be charged $3,56,250 for legal services.
We follow these steps to arrive at the answer.
Total Legal Expenses = $500,000
Total hours of service = 2,000 hrs
Legal Expense/per hour = $250 (Total Legal Expenses / Total Hours of service)
No. of legal hours used by the southern department = 1,425 hours
Legal Expense charged to the southern department = 1,425 × $250