A company has three departments. Department A has 10 employees with an average annual salary of $50,000. Department B has 15 employees with an average annual salary of $60,000. Department C has 5 employees with an average annual salary of $80,000. What is the average annual salary of all employees in the company?
$58,000
$59,000
$60,000
$61,000
$62,000
