(A possible version)

   According to a recent survey, about 25 percent of college students have a part-time job£®During summer vacation, this figure will increase to 72 percent£®College students are working as tutors, waiters or salesmen£®

   Why do they want part-time jobs£¿First£¬they want to earn money to help cover the increasingly higher college tuition£®Second, they hope to be economically independent and buy whatever they want£®