Dc construction has two divisions: remodeling and new home construction. each division has an on-site supervisor who is paid a salary of $69,000 annually and one salaried estimator who is paid $49,500 annually. the corporate office has two office administrative assistants who are paid salaries of $56,250 and $36,000 annually. the president's salary is $184,500. how much of these salaries are common fixed expenses?