Dongying's gold management business has a length of service of 4500 a year. Under normal circumstances, the length of service salary of the career series will be increased from 30 yuan to 50 yuan for one year. For example, in the career department of a newly-hired institution, the seniority salary is usually 50 yuan. In addition, the length of service salary can only be accumulated for 10 years, and it will basically not change after 10 years.