Carla is a college freshman who lives in Manhattan during the summer. She has 2 summer job opportunities. She can work as a sales associate in a clothing store located near her apartment; the offer is $20/hour for a 30-hour work week for 10 weeks during the summer. She also has an offer as a summer intern as a data analyst for financial firm in Stamford, CT. She would gain work experience, but she would earn no income from this job. She would also have to commute to her job and commutation costs are $100 for the weekly train ticket. a) What is the opportunity cost of taking the job as a sales associate? b) What is the opportunity cost of the summer internship