Jane has a firm and she is looking for a new hire. Among the pool of applicants there are good workers (70% of the applicants) and bad workers (30% of the applicants). Bad workers can never successfully complete the tasks assigned to them, while good workers always successfully complete their tasks. Jane randomly selects an applicant and hires them. What is the probability that the selected applicant will successfully complete the tasks assigned to them?
a) 70%
b) 30%
c) 100%
d) 50%