Jack made $30 mowing lawns in may and $72 mowing lawns in june. by what percent did the amount of money jack made mowing lawns increase from may to june. show work to support you answer

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?