What is the meaning of comparative advantage

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?

Ineed here’s a picture of the question