At a certain company, the average (arithmetic mean) salary of 10 of the employees is $30,000, the average salary of 30 other employees is $40,000, and the average salary of the remaining 20 employees is $60,000. What is the average salary of the 60 employees at the company?
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A$40,000
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B$43,000
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C$45,000
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D$60,000
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E$65,000
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正确答案: C