Answer:
70 to 80 percent
Step-by-step explanation:
According to various online sources, including Career Horizons, about 70 to 80 percent of jobs are not published. It means that these vacancies are not publicly advertised. The only way of knowing that the vacancies exist is through networking.
Getting a job requires one to be a member of a professional network. It is the only sure way of getting to know about the 70 to 80 percent of unadvertised jobs.