In a certain company, the total monthly payroll for the 12 production workers is $18,000 and the total monthly payroll for the 36 office workers is $63,000. By how much does the average (arithmetic mean) monthly salary of an office worker exceed that of a production worker in this company?
(A) $62.50
(B) $187.50
(C) $250.00
(D) $375.00
(E) $500.00
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