A recent study conducted by human resources manager found that 25% of the employee who left the company within two years did so primarily because they were dissatisfied with their salary, 20% left because they were dissatisfied with their work assignments, and 10% of the former employees indicated dissatisfaction with both their salary and their work assignments. What is the probability that an employee who leaves within two years does so because of dissatisfaction with their salary, dissatisfaction with the work assignment, or both