Jen Is Offered a Job Answering the Phone in the State

Jen is offered a job answering the phone in the State U economics department during lunchtime, from noon to 1 p.m., Tuesdays and Thursdays. Her reservation wage for this job is $15 per hour. If the department chair offers Jen $150 per week, how much economic surplus will she enjoy as a result of accepting the job?

A) $15 per week
B) $120 per week
C) $135 per week
D) $150 per week