A shared employee for Tetra Computers works in both the programming and the research departments for the company and splits their time equally in both roles. In the programming department, the employee earns $20 per hour and $28 per hour in the research department. What is this pay rate if the employee worked overtime in the research department?
1. $30 per hour
2. $36 per hour
3. $42 per hour
4. $48 per hour